Practice Test


Q1) Most stable configuration is the configuration of Show Answer


Q2) Atoms combine to form molecules because Show Answer


Q3) According to octet rule, the number of electrons in the valence shell of central atom of the molecule is Show Answer


Q4) Valency expresses Show Answer


Q5) Valence electrons are those present in Show Answer


Q6) Combination of atoms takes place because Show Answer


Q7) Valency of an atom with electronic configuration 2,8,8,1 is Show Answer


Q8) When a molecule is formed by the combination of two atoms Show Answer


Q9) According to octet theory during bond formation Show Answer


Q10) Bond formed between two unlike atom is Show Answer


Q11) Melting and boilling point of ionic compounds are Show Answer


Q12) The type of bond between two atoms depends upon Show Answer


Q13) In the formation of magnesium chloride molecule Show Answer


Q14) The atomic numbers of two elements A and B are X and X+2. If B is an alkali metal, the bonding in A-B is Show Answer


Q15) Electronegativities of atoms give information about Show Answer


Q16) Electropositive atom forms anion by Show Answer


Q17) Electronegative element forms an ion by Show Answer


Q18) Ionic bond involves Show Answer


Q19) Which of the following statement regarding covalent bonding is false? Show Answer


Q20) In a double bond formed between two atoms number of shared electrons are Show Answer


Q21) Bond formed between like atoms is Show Answer


Q22) Convalent bond involves Show Answer


Q23) Bond between Cl-Cl is a Show Answer


Q24) A pure covalent bond is formed with element having Show Answer


Q25) Maximum number of bonds between two atoms of a convalent bond can be Show Answer


Q26) An example for a diatomic molecule having double bonds between its atoms is Show Answer


Q27) Chlorine atoms combine to form chlorine molecule because it Show Answer


Q28) Electron deficient molecules are those, which are formed by Show Answer


Q29) During bond formation normally all the elements in their outermost shell acquire Show Answer


Q30) Bond order is defined as Show Answer


Q31) Bond order is Show Answer


Q32) In a convalent bond,______ the bond length _______ is the energy required to break the bond. Show Answer


Q33) The electronegativity of C, H, O, N and S are 2.5,2.1, 3.5, 3.0, and 2.5 respectively. Which of the following is most polar? Show Answer


Q34) If the average bond dissociation energy of water is 462.75 kJ/mole and the dissociation energy of second O - H bond is 424.7 kJ/mole, the bond dissociation energy of first O - H bond is Show Answer


Q35) Which of the following condition is NOT correct for resonating structures? Show Answer


Q36) What is NOT true about resonance? Show Answer


Q37) Covalent compounds dissolve in Show Answer


Q38) Carbon tetrachloride has NO net dipole moment because of Show Answer


Q39) Electronegativity values of elements help in predicting Show Answer


Q40) A bond is said to be 50% ionic, when the difference in the electronegativity value of the participating atoms is Show Answer


Q41) Which of the following bonds will be the most polar? Show Answer


Q42) A hydrogen-halogen (H-X) bond is polar since Show Answer


Q43) The unit of dipole moment is Show Answer


Q44) Ionic compound dissolve in Show Answer


Q45) When total attractive forces between two atoms is greater than total repulsive forces then P.E of a system Show Answer


Q46) Chlorine molecule is formed by the Show Answer


Q47) In a hydrogen molecule, the attractive and repulsive forces between the atoms are balanced at Show Answer


Q48) An atomic orbital not having a particular direction in space is Show Answer


Q49) H- X bond is formed due to Show Answer


Q50) s-p overlap is defined as the overlapping between Show Answer


Q51) Fluorine molecule is formed by Show Answer


Q52) Hybridization involves Show Answer


Q53) According to valence bond theory, which of the following is a TRUE statement? Show Answer


Q54) Choose the correct statement Show Answer


Q55) In Be, how many electrons are available for bonding, according to VBT? Show Answer


Q56) The weakest bond among the following is Show Answer


Q57) The number of unhybridized orbitals in an acetylene molecule is Show Answer


Q58) The molecule with the shortest distance between the two adjacent carbon atoms is Show Answer


Q59) Number of lone pair of electrons in ethene and borontrifluoride are______ and _______ respectively. Show Answer


Q60) Methane molecule contains ________ lone pairs and _____ bond pairs. Show Answer


Q61) In a homologous series, the percentage of 's' character Show Answer


Q62) The percentage of 'p' character of the hybrid orbitals in methane, ethylene and acetylene are ______ respectively Show Answer


Q63) VBT fails to explain, (i) Directional nature of covalent bond, (ii) Formation of co-ordinate convalent bond, (iii) Paramagnetism of oxygen molecule, (iv) Bonding in electron deficient compound Show Answer


Q64) The concept of bond order in the molecular orbital theory depends on the number of electrons in the bonding and antibonding orbital. The bond order Show Answer


Q65) Which of the following statement is not correct regarding bonding molecular orbitals? Show Answer


Q66) Which of the following theory provides good explanation about the paramagnetic behaviour of oxygen? Show Answer


Q67) Antibonding molecular orbital is formed by Show Answer


Q68) The bond formed in fluorine molecule is Show Answer


Q69) H- bonding is exhibited by Show Answer


Q70) Density of ice is less than that of water because of Show Answer


Q71) Strongest hydrogen bond is shown by Show Answer


Q72) Electronic configuration of an element is 2, 8, 8, 2. Its valency will be Show Answer


Q73) Ionic bonds are formed between Show Answer


Q74) A bond with maximum covalent character in non-metallic elements is found between Show Answer


Q75) A hydrogen molecule is formed between two hydrogen atoms, only when Show Answer


Q76) According to Molecular orbital theory ______. Show Answer


Q77) There is no hydrogen bonding in Show Answer


Q78) Which of the following geometry does NOT correspond to number of bond pairs given in bracket? Show Answer


Q79) The compound with zero dipole moment is Show Answer


Q80) For a stable molecule the value of bond order should be Show Answer


Q81) The electron dot representations of covalent molecules is also
Show Answer


Q82) The charge on a cation M is +2 and on an anion A is -3. The compound formed by them has the formula. Show Answer


Q83) Outermost electronic configuration of four element is given. The one with greatest tendency to form electrovalent bond will be Show Answer


Q84) Which of the following is ionic compound? Show Answer


Q85) Which of the following is a covalent compound? Show Answer


Q86) Which one of the following is an electron deficient compound? Show Answer


Q87) In central atom of which of the following molecules the outermost orbit contains more than 8 electrons? Show Answer


Q88) Which of the following is the electron deficient molecule? Show Answer


Q89) Which of the following have odd number of electrons? Show Answer


Q90) Resonance structure can be written for Show Answer


Q91) Which of the following molecule is non polar? Show Answer


Q92) LiI is more covalent than LiCl due to presence of Show Answer


Q93) The p-p orbital overlap is present in Show Answer


Q94) Which of the following statement is WRONG? Show Answer


Q95) Which of the following will provide the most efficient overlap? Show Answer


Q96) A hybrid orbital formed from s and p-orbital can contribute to Show Answer


Q97) Square planar molecules undergo_______ hybridization Show Answer


Q98) Which of the following molecule is T-shaped? Show Answer


Q99) A sigma bond is formed by overlapping of Show Answer


Q100) Which of the following molecule has a linear shape? Show Answer


Q101) Which of the following molecules does not contain a lone pair of electrons? Show Answer


Q102) Which carbon is most electronegative? Show Answer


Q103) Formaldehyde molecule contains Show Answer


Q104) Which of the following molecule possesses pyramidal structure? Show Answer


Q105) In the excited state an electron from 2s orbital of beryllium jumps to Show Answer


Q106) Formation of an excited state will NOT be observed in the hybridization for the for formation of Show Answer


Q107) Which of the following molecule has two p-orbitals unused? Show Answer


Q108) Molecule having one lone pair of electron is Show Answer


Q109) The increasing order of bond angles in the molecules of water, ammonia, methane and carbon dioxide is Show Answer


Q110) In which of the following is the angle between the two covalent bonds greatest? Show Answer


Q111) On hybridization of one s and one p orbital we get, Show Answer


Q112) Which of the following cannot exist on the basis of MO theory? Show Answer


Q113) Which of the following is paramagnetic? Show Answer


Q114) The oxygen molecule contains Show Answer


Q115) A diatomic molecule is not formed for Show Answer


Q116) Which of the following molecules has one lone pair of electrons on the central atom? Show Answer


Q117) Which of the following molecule has net dipole moment? Show Answer


Q118) The carbon monoxide molecule may be represented by the following structures except Show Answer


Q119) Which of the following is the electronic configuration of nitrogen atom in the excited state? Show Answer


Q120) In a double bond connecting two atoms there is a sharing of Show Answer


Q121) Pi bond is formed by the overlapping of Show Answer


Q122) Which of the following bonds is the most ionic ? Show Answer


Q123) Which of the following contains both covalent and ionic bonds ? Show Answer


Q124) In which of the compounds, there is an electrovalent linkage ? Show Answer


Q125) Sulphuric acid molecule contains Show Answer


Q126) Which of the following contains a coordinate covalent bond ? Show Answer


Q127) Hydrogen chloride molecule contains Show Answer


Q128) How many sigma and pi bonds are present in tetracyanoethylene ? Show Answer


Q129) Which of the following substance has the least ionic character ? Show Answer


Q130) Which chloride should exhibit the most covalent type of bond ? Show Answer


Q131) Carbon dioxide is isostructural with which of the following ? Show Answer


Q132) The correct order of decreasing polarisability of the ion is Show Answer


Q133) Which of the following statement is not correct, for sigma pi-bonds formed between two carbon atoms ? Show Answer


Q134) How many sigma and pi - bonds are present in toluene ? Show Answer


Q135) Sulphuric acid provides a simple example of Show Answer


Q136) The correct order of the lattice energies of the following ionic compounds is Show Answer


Q137) Which of the following does not contain coordinate bond ? Show Answer


Q138) Which of the following is least ionic ? Show Answer


Q139) A bond with maximum covalent character between non-metallic element is found Show Answer


Q140) Covalent compounds are soluble in Show Answer


Q141) The bond between two identical non metal atoms has a pair of electrons Show Answer


Q142) In covalent bond Show Answer


Q143) Which of the following factors do not have favour electrovalency ? Show Answer


Q144) Among all alkaline earth metals the element forming predominantly covalent compound is Show Answer


Q145) Fluorine molecule is formed by Show Answer


Q146) Which of the following has covalent as well as ionic valency ? Show Answer


Q147) Which of the following is least ionic ? Show Answer


Q148) According to Fajan's rule, covalent bond is favoured by Show Answer


Q149) The electronegativities of F, Cl, Br and I are 4, 0, 3, 0, 2, 8, 2, 5 respectively. Hydrogen halide with a high percentage of ionic character is Show Answer


Q150) Outermost shells of two elements X and Y have two and six electrons respectively. If they combine, the expected formula of compound will be Show Answer


Q151) Which of the following is electron deficient ? Show Answer


Q152) Which of the following phenomena will occur when two atoms of the elements having same spin of electron approach for bonding ? Show Answer


Q153) In which of the following molecules is the covalent bond most polar ? Show Answer


Q154) Covalent compounds have low melting points because Show Answer


Q155) Chemical bond implies Show Answer


Q156) A lone pair of electrons in an atom implies Show Answer


Q157) Sodium chloride is an ionic compound whereas hydrogen chloride is mainly covalent because Show Answer


Q158) The number and types of bonds between carbon atoms in calcium carbide are Show Answer


Q159) Of the following sets which does not contain isoelectronic species ? Show Answer


Q160) Which of the following is electron deficient molecule ? Show Answer


Q161) Correct sequence of increasing covalent character is represented by Show Answer


Q162) The compound which contains both ionic and covalent bonds is Show Answer


Q163) Element X is strongly electropositive and element Y is strongly electronegative. Both are univalent.The compound formed would be Show Answer


Q164) Which of the following compounds is covalent ? Show Answer


Q165) Which ion is isoelectronic with CO ? Show Answer


Q166) The enolic form of acetone has Show Answer


Q167) Which is most ionic ? Show Answer


Q168) Which of the following statements is not correct ? Show Answer


Q169) In which of the following the angle between the two covalent bonds is largest ? Show Answer


Q170) Which has the minimum bond angle ? Show Answer


Q171) The pyramidal geometry is associated with Show Answer


Q172) Which one of the following has tetrahedral disposition ? Show Answer


Q173) A molecular is square planar with no lone pair. What type of hybridisation is associated with it ? Show Answer


Q174) Which of the following molecules is linear ? Show Answer


Q175) The octahedral shape is associated with Show Answer


Q176) The hybrid state of carbon is diamond, graphite and acetylene are respectively. Show Answer


Q177) Which overlap is involved in HCl molecule ? Show Answer


Q178) Which of the following molecule / ions has triangular pyramidal shape ? Show Answer


Q179) Which of the following pairs contains iso - structural species ? Show Answer


Q180) Directed bond in water forms an angle of nearly Show Answer


Q181) The angles between covalent bonds is maximum in Show Answer


Q182) One of the following is having square planar structure Show Answer


Q183) According to VSEPR theory, the shape of the water molecule is Show Answer


Q184) Which of the following is planar ? Show Answer


Q185) which of the following will be octahedral ? Show Answer


Q186) Carbon atoms in benzene molecule are inclined at an angle of Show Answer


Q187) Polarisation of electrons in acrolein may be written as Show Answer


Q188) Which one of the following molecules will have unequal bond lengths ? Show Answer


Q189) Most efficient overlaping is Show Answer


Q190) Slidewise overlap of p - p orbitals forms Show Answer


Q191) Which of the following bonds requires the largest amount of bond energy to disassociated the atoms concerned ? Show Answer


Q192) Berylium atom in berylium fluoride is Show Answer


Q193) Structure of ammonia is Show Answer


Q194) Which of the following has unchanged valency ? Show Answer


Q195) The ion which is not tetrahedral in shape is Show Answer


Q196) Which of the following is correct ? Show Answer


Q197) Which one of the following has the smallest bond angle ? Show Answer


Q198) Which of the following compounds possesses C - H bond with the lowest bond dissociation energy ? Show Answer


Q199) Which carbon is more electronegative ? Show Answer


Q200) In which of the following molecules the central atom does not follow the octet rule ? Show Answer


Q201) Which one of the following molecule has the smallest bond angle ? Show Answer


Q202) The ONO angle is maximum in Show Answer


Q203) Among the following, the pair in which the two species are not isostructural is Show Answer


Q204) On hybridisation of one s and p orbital we get Show Answer


Q205) Which of the following is a linear molecule ? Show Answer


Q206) Which of the following bonds is most polar ? Show Answer


Q207) Which one of the following statement is true ? Show Answer


Q208) Which of the following has zero dipole moment ? Show Answer


Q209) Which of the following is polar ? Show Answer


Q210) Which of the following molecules does not have dipole moment ? Show Answer


Q211) Which of the following compound(s) is non-polar ? Show Answer


Q212) Among the following compounds, which has a dipole moment ? Show Answer


Q213) The dipole moment is the highest for Show Answer


Q214) The linear combination of two hybridised orbitals each having one electron and belonging to two different atoms leads to a Show Answer


Q215) Which pair among the following is isostructural ? Show Answer


Q216) In acetylene molecule, the two carbon atoms are linked by Show Answer


Q217) A square planar complex is formed by hybridisation of which atomic orbitals ? Show Answer


Q218) The decreasing order of bond angle is Show Answer


Q219) Which of the following arrangement of molecules is correct on the basis of their dipole moments ? Show Answer


Q220) The correct sequence of decrease in the bond angles of the following hybrides is Show Answer


Q221) Which one of the following has the regular tetrahedral structure ?
(Atomic no. : B = 5, S = 16, Ni = 28, Xe = 54) Show Answer


Q222) Lattice energy of an ionic compound depends upon Show Answer


Q223) Which of the following would have a permanent dipole moment ? Show Answer


Q224) The correct order in which O - O bond length increases in the following is Show Answer


Q225) The octet rule is not valid for the molecule Show Answer


Q226) Amongst the following molecules the one with the largest distance between the two adjacent carbon atoms is Show Answer


Q227) Which of the following compounds has a linear structure ? Show Answer


Q228) Dipole moment is shown by Show Answer


Q229) Which one of the following halogens has the highest bond energy ? Show Answer


Q230) Amongst the following the molecule that is linear is Show Answer


Q231) The species which has pyramidal shape is Show Answer


Q232) The molecular which has zero dipole moment is Show Answer


Q233) Which contains both polar and non polar bonds ? Show Answer


Q234) Which of the following, hydrocarbons has the lowest dipole moment ? Show Answer


Q235) Among the following, the molecule with the highest dipole moment is Show Answer


Q236) The compound which has maximum number of lone pairs of electrons on central atom is Show Answer


Q237) Which of the following compounds can form hydrogen bond ? Show Answer


Q238) Which of the following does not apply to bonding in metals ? Show Answer


Q239) Which one of these is weakest ? Show Answer


Q240) The high density of water compared to ice is due to Show Answer


Q241) Which is most viscous ? Show Answer


Q242) Which one of the following molecules will form a linear polymeric structure due to hydrogen bonding ? Show Answer


Q243) The boiling of para-nitrophenol is greater than that of ortho - nitrophenol, because Show Answer


Q244) The boiling point of methanol is greater than methyl thiol because Show Answer


Q245) H - bonding is not present in Show Answer


Q246) Intermolecular forces in solid hydrogen are Show Answer


Q247) The luster of the metal is on account of Show Answer


Q248) The nature of inter - particle forces in benzene is Show Answer


Q249) When two ice cubes are pressed over each other, they unite to form one cube. Which of the following forces is responsible to hold them together ? Show Answer


Q250) The maximum extent of H - bonding is shown by Show Answer


Q251) Which of the following does not conduct electricity ? Show Answer


Q252) The number of electrons that are paired in oxygen molecule is Show Answer


Q253) The boiling point of heavy water is Show Answer


Q254) Methanol and ethanol are miscible in water due to Show Answer


Q255) The bond order of a molecule is given by Show Answer


Q256) The bond angle H -O - H in ice is closest to Show Answer


Q257) In a homonuclear molecule which of the following set of orbitals are degenerate ? Show Answer


Q258) Other factors being constant which bond order is expected to correspond to shortest bond length ? Show Answer


Q259) Which of the following is non - existent according to molecular orbital theory ? Show Answer


Q260) The molecular species having highest bond order is Show Answer


Q261) Which of the following is not paramagnetic ? Show Answer


Q262) An ionic solid is a poor conductor of electricity because Show Answer


Q263) Paramagnetism is exhibited by molecules which Show Answer


Q264) Which of the following species is paramagnetic ? Show Answer


Q265) Which one among the following is not paramagnetic ?
( At. no. Be =4 ; Ne = 10 ; Cl =17 ; As = 33) Show Answer


Q266) What is the correct sequence of bond order ? Show Answer


Q267) The molecule having bond order 3 is Show Answer


Q268) Which of the following is not paramagnetic ? Show Answer


Q269) Which of the following is paramagnetic ? Show Answer


Q270) Which of the following hydrides has the lowest boiling point ? Show Answer


Q271) Antibonding MO formed by Show Answer


Q272) Two nodal planes are present in Show Answer


Q273) Which one of the following species is diamagnetic in nature ? Show Answer


Q274) Which of the following is soluble in water ? Show Answer


Q275) Oxygen molecule is paramagnetic because Show Answer


Q276) The molecule having one unpaired electron is Show Answer


Q277) Hydrogen bonding is maximum in Show Answer


Q278) Which of the following species is paramagnetic ? Show Answer


Q279) Combination of two AOs leads to the formation of Show Answer


Q280) The maximum possible number of hydrogen bonds in which a water molecule can participate is Show Answer


Q281) Which of the following molecular species has unpaired electron(s) ? Show Answer


Q282) Which of the following is not paramagnetic. Show Answer


Q283) The pair of molecules forming strongest intermolecular hydrogen bonding are Show Answer


Q284) Which of the following is not linear ? Show Answer


Q285) Which of the following compounds, shows ionic, covalent and coordinate bonds ? Show Answer


Q286) Which of the following is non - polar ? Show Answer


Q287) Which of the following has no dipole moment ? Show Answer


Q288) Which one of the following is highest melting halide ? Show Answer


Q289) Which of the following is non - linear molecule ? Show Answer


Q290) The polarising ability of which one of the following is highest ? Show Answer


Q291) Which of the following molecules has pyramidal shape ? Show Answer


Q292) Which of the following has covalent bond ? Show Answer


Q293) Increasing order of electronegativity of the hybrid orbitals is Show Answer


Q294) Among the following, shortest bond length is in Show Answer


Q295) Pair of species having identical shapes for molecules is Show Answer


Q296) Metallic luster is explained by Show Answer


Q297) Which of the following represents isostructural pairs ? Show Answer


Q298) Among the following, the pair in which the two species are not isostructural is Show Answer


Q299) Which of the following molecules / ions does not contain unpaired electrons ? Show Answer


Q300) Among the following mixtures, dipole - dipole as the major interaction, are present in Show Answer


Q301) In which of the following molecules / ions are all the bonds not equal ? Show Answer


Q302) Which of the following species exhibits the diamagnetic behaviour ? Show Answer


Q303) In which of the following ionization processes, the bond order has increased and the magnetic behaviour has changed ? Show Answer


Q304) Which of the following hydrogen bonds is the strongest ? Show Answer


Q305) Which one of the following constitutes a group of the isoelectronic species ? Show Answer


Q306) Using MO theory predict which of the following species has the shortest bond length ? Show Answer


Q307) (I) 1,2 - dihydroxy benzene
(II) 1,3 - dihydroxy benzene
(III) 1,4 - dihydroxy benzene
(IV) Hydroxy benzene.
The increasing order of boiling points of above mentioned alcohols is Show Answer


Q308) The species having bond order different from that in CO is Show Answer


Q309) Among the following, the paramagnetic compound is Show Answer


Q310) Statement 1: Oxygen does not possess d- orbitals in their valency shell
Statement 2: The covalency of oxygen is two
Show Answer


Q311) Statement 1: NaCl is more ionic than NaI.
Statement 2: Chlorine is more electronegative than iodine.
Show Answer


Q312) Statement 1: Bond energy has order likeC-C<=C Statement 2: Bond energy increases with increase in bond order
Show Answer


Q313) Statement 1: LiCl is predominantly a covalent compound.
Statement 2: Electronegativity difference between Li and Cl is too small.
Show Answer


Q314) Statement 1: Ionisation enthalpy is always positive.
Statement 2: Energy is always required when electrons are removed.
Show Answer


Q315) Statement 1: Alkanes are insoluble in water
Statement 2: Organic compounds do not form hydrogen bonding with water
Show Answer


Q316) Statement 1: F-F bond has low bond dissociation energy
Statement 2: The fluorine has low reactivity
Show Answer


Q317) Van der Waals’ forces between molecules depend upon: Show Answer


Q318) An atom with atomic number 20 is most likely to combine chemically with the atom whose atomic number is: Show Answer


Q319) Which has the largest distance between the carbon hydrogen atom? Show Answer


Q320) Length of hydrogen bond ranges from 2.5Å to: Show Answer


Q321) Which molecule is planar? Show Answer


Q322) Two ice cubes are pressed over each other until they unite to form one block. Which one of the following forces dominates for holding them together? Show Answer


Q323) Maximum number of covalent bonds between two like atoms can be: Show Answer


Q324) When sodium and chlorine react, energy is: Show Answer


Q325) The element having lowest ionisation energy among the following is: Show Answer


Q326) Two type FXF angles are present in which of the following molecules? (X=S, Xe, C) Show Answer


Q327) Which is electron deficient compound? Show Answer


Q328) Which of the following is not correct regarding the properties of ionic compounds? Show Answer


Q329) Which of the following is not tetrahedral? Show Answer


Q330) Linear combination of two hybridized orbitals, belonging to two atoms and each having one electron leads to: Show Answer


Q331) In allene structure, three carbon atoms are joined by: Show Answer


Q332) The carbon atom in graphite is: Show Answer


Q333) Boron cannot form which one of the following anions? Show Answer


Q334) If Z-axis is the molecular axis, then π-molecular orbitals are formed by the overlap of Show Answer


Q335) Which one is the weakest bond? Show Answer


Q336) According to MO theory, which of the following lists ranks the nitrogen species in terms of increasing bond order? Show Answer


Q337) The equilateral triangle shape has: Show Answer


Q338) Which of the following has fractional bond order? Show Answer


Q339) For which of the following hybridization the bond angle is maximum? Show Answer


Q340) Stability of hydrides generally increases with: Show Answer


Q341) Which can be described as a molecule with residual bonding capacity? Show Answer


Q342) Lattice energy of an ionic compound depends upon Show Answer


Q343) Among the following elements, the most electronegative is: Show Answer


Q344) Metallic bonds do not play a role in: Show Answer


Q345) Which p-orbitals overlapping would give the strongest bond? Show Answer


Q346) When two atomic orbitals combine, they form: Show Answer


Q347) The correct increasing covalent nature is: Show Answer


Q348) Greater the dipole moment: Show Answer


Q349) Which of the following molecular orbitals has two nodal planes? Show Answer


Q350) Hydrogen bonding is maximum in Show Answer


Q351) The O—H bond distance in water molecule is: Show Answer


Q352) Which among the following molecules/ ions is diamagnetic? Show Answer


Q353) The enolic form of acetone contains Show Answer


Q354) Which of the following is paramagnetic with bond order 0.5? Show Answer


Q355) Water has high heat of vaporization due to: Show Answer


Q356) The C – H bond distance is the longest in Show Answer


Q357) If the electronegativity difference between two atoms A and B is 2.0, then the percentage of covalent character in the molecule is Show Answer


Q358) Polar covalent compounds are soluble in: Show Answer


Q359) Which does not show hydrogen bonding? Show Answer


Q360) Which among the following has highest ionic radius? Show Answer


Q361) Zero dipole moment is possessed by Show Answer


Q362) Which one of the following orders is not in according with the property stated against it? Show Answer


Q363) The incorrect statements regarding bonding molecular orbitals because: Show Answer


Q364) A coordinate bond is a dative covalent bond. Which of the below is true? Show Answer


Q365) The electronegativity values of C, H, O, N and S are 2.5, 2.1, 3.5, 3.0 and 2.5 respectively. Which of the following bonds is most polar? Show Answer


Q366) Which of the following has largest size? Show Answer


Q367) In which of the following, the bond length between hybridised carbon atom and other carbon atom is minimum? Show Answer


Q368) Which is expected to conduct electricity? Show Answer


Q369) Metals are good conductors of electricity because they contain Show Answer


Q370) The species having pyramidal shape is Show Answer


Q371) The attraction that non-polar molecules have for each other is primarily caused by: Show Answer


Q372) In HCHO carbon atom has hybridisation: Show Answer


Q373) Which of the following species has four lone pairs of electrons in its outer shell? Show Answer


Q374) Chlorine atom, in its third excited state, reacts with fluorine to form a compound X. The formula and shape of X are Show Answer


Q375) In which of the following molecules are all the bonds not equal? Show Answer


Q376) Which of the following compound is covalent? Show Answer


Q377) Which of the following molecular species has unpaired electron (s)? Show Answer


Q378) The correct order of bond angles is: Show Answer


Q379) If the bond length and dipole moment of a diatomic molecule are 1.25 A and 1.0 D respectively, what is the per cent ionic character of the bond? Show Answer


Q380) The molecule which does not exhibit dipole moment is Show Answer


Q381) The correct order of radii is: Show Answer


Q382) The bond order is maximum in: Show Answer


Q383) Which of the following atoms has minimum covalent radius? Show Answer


Q384) The screening effect of d-electrons is: Show Answer


Q385) Which of the following statement is wrong? Show Answer


Q386) The molecule having permanent dipole moment is: Show Answer


Q387) Unusually high boiling point of water is result of Show Answer


Q388) Which of the following is least ionic? Show Answer


Q389) A compound contains X, Y and Z atoms. The oxidation states of X, Y and Z are +2, +2 and -2 respectively. The possible formula of the compound is Show Answer


Q390) Which one of the following is a non-polar molecule? Show Answer


Q391) Which one of the following has the regular tetrahedral structure?
(Atomic numbers B = 5, S = 16, Ni = 28, Xe = 54)
Show Answer


Q392) If the dipole moment of toluene and nitro-benzene are 0.43 D and 3.93 D, then what is the expected dipole moment of p-nitro toluene? Show Answer


Q393) Which of the following is most stable? Show Answer


Q394) Which one of the following pairs of species has the same bond order: Show Answer


Q395) Which of the following characteristics regarding halogens is not correct? Show Answer


Q396) The number of S – S bonds in sulphur trioxide is Show Answer


Q397) The low density of ice compared to water is due to Show Answer


Q398) Which of the following compounds has dipole moment approximately equal to that of chlorobenzene? Show Answer


Q399) Which of the following overlaps leads to bonding? Show Answer


Q400) Which of the following is correct? Show Answer


Q401) The number of sigma and pi bonds in peroxodisulphuric acid are respectively Show Answer


Q402) Which is not a paramagnetic species? Show Answer


Q403) Electron deficient species are known as: Show Answer


Q404) The molecule having three folds of axis of symmetry is: Show Answer


Q405) Among the following the molecule with the highest dipole moment is Show Answer


Q406) A molecule which cannot exist theoretically is: Show Answer


Q407) An atom X has three valence electrons and atom Y has six valence electrons. The compound formed between them will have the formula Show Answer


Q408) Which one is polar molecule among the following? Show Answer


Q409) Shape of molecules is decided by: Show Answer


Q410) The shape of carbon dioxide is Show Answer


Q411) The correct ionic radii order is: Show Answer


Q412) Which is not linear? Show Answer


Q413) Hybridisation of oxygen in diethyl ether is Show Answer


Q414) What is the effect of more electronegative atom on the strength of ionic bond? Show Answer


Q415) Which of the following two are isostructural? Show Answer


Q416) Which molecule is linear? Show Answer


Q417) Which of the following shows minimum melting point? Show Answer


Q418) Which of the following does not have a lone pair on the central atom? Show Answer


Q419) Molecular orbital theory was given by Show Answer


Q420) Proton plays an important role in…bonding. Show Answer


Q421) Which represents a collection of isoelectronic species? Show Answer


Q422) An electrovalent compound does not exhibit space isomerism due to: Show Answer


Q423) In which one of the following species, the central atom has the type of hybridization which is not the same as that present in other three? Show Answer


Q424) C-Cl bond is stronger than C –I bond, because Show Answer


Q425) The ICl molecule is: Show Answer


Q426) Which of the following silver salts is insoluble in water? Show Answer


Q427) Silicon has 4 electrons in the outermost orbit. In forming the bond: Show Answer


Q428) Chlorine atom tends to acquire the structure of: Show Answer


Q429) Intramolecular hydrogen bond is present in Show Answer


Q430) According to VSEPR theory the repulsion between different pair (lone or bond) of electrons obey the order Show Answer


Q431) The bond between two identical non-metal atoms has a pair of electrons: Show Answer


Q432) The correct order of increasing electropositive character among Cu,Fe and Mg is: Show Answer


Q433) The electron affinity for inert gases is likely to be: Show Answer


Q434) 1,3-butadiene has: Show Answer


Q435) The bond between atoms of two elements of atomic number 37 and 53 is: Show Answer


Q436) In methane the bond angle is Show Answer


Q437) One would expect the elemental form of Cs at room temperature to be: Show Answer


Q438) Which of the following is false? Show Answer


Q439) Ionic radii are: Show Answer


Q440) Which of the following statements is incorrect? Show Answer


Q441) Which of the following pairs will from the most stable ionic bond? Show Answer


Q442) Among NaF,NaCl NaBr and NaI, the NaF has highest melting point because: Show Answer


Q443) Which of the following has regular tetrahedral shape? Show Answer


Q444) Which of the following will have large dipole moment? Show Answer


Q445) In which of the following pairs the two species are not isostructural? Show Answer


Q446) The molecule having a pyramidal shape out of the following is Show Answer


Q447) An atom of an element A has three electrons in its outermost orbit and that of B has six electrons in its outermost orbit. The formula of the compound between these two will be Show Answer


Q448) The bond angle in ammonia molecule is Show Answer


Q449) Which statement is wrong? Show Answer


Q450) Which of the following molecules has three fold axis of symmetry? Show Answer


Q451) Oxygen and the oxide ion have the Show Answer


Q452) Valence bond theory of metallic bond was given by Show Answer


Q453) The correct order of second ionisation potential of carbon, nitrogen, oxygen and fluorine is: Show Answer


Q454) The molecule which has T – shaped structure is Show Answer


Q455) As a result of resonance: Show Answer


Q456) The pair of species with the same bond order is: Show Answer


Q457) Which of the following molecules has pentagonal bipyramidal shape? Show Answer


Q458) The number of types of bonds between two carbon atoms in calcium carbide is Show Answer


Q459) The bond angle between H—O—H in ice is closest to: Show Answer


Q460) Which combination of atoms can form a polar covalent bond? Show Answer


Q461) H-bonding is not present in: Show Answer


Q462) In which of the following gaseous molecules, the ionic character of the covalent bond is greatest? Show Answer


Q463) The angle between the overlapping of one s-orbital and one p-orbital is: Show Answer


Q464) Which is expected to have linear structure? Show Answer


Q465) Carnallite in solution in water shows the properties of Show Answer


Q466) A simple of a coordinate covalent bond is exhibited by Show Answer


Q467) In the series ethane, ethylene and acetylene, the C—H bond energy is: Show Answer


Q468) In which molecule the van der Waals’ force is likely to be the most important in determining the m.p. and b.p.? Show Answer


Q469) Identify the wrong statement in the following: Show Answer


Q470) (I)1, 2-dihydroxy benzene
(II) 1, 3-dihydroxy benzene
(III) 1, 4-dihydroxy benzene
(IV) Hydroxy benzene
The increasing order of boiling points of above mentioned alcohols is
Show Answer


Q471) Dipole moment is shown by Show Answer


Q472) In which molecular are all atoms coplanar? Show Answer


Q473) The compound with the maximum dipole moment among the following is: Show Answer


Q474) Which of the following bonds require the largest amount of energy to dissociate the bond concerned? Show Answer


Q475) The sequence that correctly describes the relative bond strength pertaining to oxygen molecule and its cation or anion is Show Answer


Q476) Which have zero dipole moment? Show Answer


Q477) Strongest bond is formed by the head on overlapping of: Show Answer


Q478) Arrange the following compound in order of increasing dipole moment:
Toluene (I) m-dichlorobenzene (II)
o-dichlorobenzene (III) p-dichlorobenzene (IV)
Show Answer


Q479) Which has maximum covalent character? Show Answer


Q480) Which species does not exist? Show Answer


Q481) Among the following which has the highest cation to anion size ratio? Show Answer


Q482) When an element of very low ionisation potential is allowed to react with an element of very high electron affinity, we get: Show Answer


Q483) Ionization potential is lowest for: Show Answer


Q484) The orbitals of same energy level providing the most efficient overlapping are: Show Answer


Q485) The covalent compound HCl has the polar character because: Show Answer


Q486) The increasing order of the ionic radii of the given isoelectronic species is: Show Answer


Q487) Which cannot exist on the basis of M.O. theory? Show Answer


Q488) Which of the following does not involve covalent bond? Show Answer


Q489) The electronegativity of A and B are 1.20 and 4.0 respectively. Therefore, ionic character in A-B bond will be Show Answer


Q490) During the formation of a chemical bond Show Answer


Q491) Pair of species having identical shapes for molecules is Show Answer


Q492) An example of a polar covalent compound is Show Answer


Q493) Which is not an exception to octet rule? Show Answer


Q494) The molecules having dipole moment are: Show Answer


Q495) Which of the following species has a bond order other than 3? Show Answer


Q496) Which of the following is planar? Show Answer


Q497) The bond angle and dipole moment of water respectively, are Show Answer


Q498) The correct order of increasing bond angles in the following species is: Show Answer


Q499) Which compound shows hydrogen bonding? Show Answer


Q500) Chlorine atom differs from chloride ion in the number of: Show Answer


Q501) What is the reason for unusual high b.p. of water? Show Answer


Q502) The increasing order of the first ionization enthalpies of the elements B, P, S and F (lower first) is: Show Answer


Q503) Which of the following is paramagnetic? Show Answer


Q504) Ionization potential of Na would be numerically the same as: Show Answer


Q505) Which one of the following conversions involve change in both hybridisation and shape? Show Answer


Q506) According to MO theory, Show Answer


Q507) The order of first electron affinity of O,S and Se is: Show Answer


Q508) The correct electronegativity order is: Show Answer


Q509) The pair of species having identical shapes for molecules of both species is Show Answer


Q510) Amongst the following, the molecule that is linear is Show Answer


Q511) Using MO theory predict which of the following species has the shortest bond length? Show Answer


Q512) The hybridisation of carbon atom in benzene is? Show Answer


Q513) Iron is tougher than sodium because: Show Answer


Q514) A bond with maximum covalent character between non-metallic elements is formed: Show Answer


Q515) When ionic compounds get dissolved in water: Show Answer


Q516) Pick the odd one out (The one having zero dipole moment): Show Answer


Q517) Which of the following shows minimum bond angle? Show Answer


Q518) Among the following isostructural compounds, identify the compound which has the highest lattice energy Show Answer


Q519) Which species is diamagnetic in nature? Show Answer


Q520) Which of the following compounds would have the highest boiling point? Show Answer


Q521) Which of the compounds has highest boiling point? Show Answer


Q522) Which has the highest bond energy? Show Answer


Q523) The incorrect statement among the following is: Show Answer


Q524) The bond angle is smallest in Show Answer


Q525) Acetic acid exists as dimer in benzene due to: Show Answer


Q526) Chemical bond formation takes place when? Show Answer


Q527) Which of the following has a bond order of 1.75? Show Answer


Q528) Higher is the bond order, greater is: Show Answer


Q529) Which has the highest ionisation potential? Show Answer


Q530) Strongest bond is in: Show Answer


Q531) Which of the following is not correct with respect to bond length of the species? Show Answer


Q532) Which is likely to have the highest melting point? Show Answer


Q533) Which of the following are not correct? Show Answer


Q534) The half of the difference between the number of electrons in bonding molecular orbitals and antibonding molecular orbitals is known as: Show Answer


Q535) Which of the following set contains species having same angle around the central atom? Show Answer


Q536) At ordinary temperature and pressure, among halogens, the chlorine is a gas, bromine is a liquid and iodine is a solid. This is because: Show Answer


Q537) Which of the following has lowest bond angle? Show Answer


Q538) Which of the following has shortest carbon-carbon bond length? Show Answer


Q539) Which one of the following constitutes a group of the isoelectronic species? Show Answer


Q540) Methanol and ethanol are miscible in water due to: Show Answer


Q541) Which has the lowest anion to cation size ratio? Show Answer


Q542) Which of the following has covalent bond? Show Answer


Q543) The correct order in which the O-O bond length increases in the following is Show Answer


Q544) As compared to covalent compounds, electrovalent compounds generally have: Show Answer


Q545) Which is present in peroxides? Show Answer


Q546) Which molecule is T-shaped? Show Answer


Q547) Which of the following is paramagnetic? Show Answer


Q548) Dipole moment is highest for: Show Answer


Q549) Which will not conduct electricity? Show Answer


Q550) The ionization potential order for which set is correct? Show Answer


Q551) The bond that determines the secondary structure of a protein is: Show Answer


Q552) Molecular orbital theory was developed mainly by Show Answer


Q553) Which species has lone pair on central atom? Show Answer


Q554) In which of the following molecules/ions are all the bonds not equal? Show Answer


Q555) Super octet molecule is: Show Answer


Q556) The number of unpaired electrons in a paramagnetic diatomic molecule of an element with atomic number 16 is: Show Answer


Q557) Which of the following statement is not correct? Show Answer


Q558) Which statement is correct? Show Answer


Q559) Which of the following pair has same structure? Show Answer


Q560) Which of the following has dipole moment? Show Answer


Q561) Which one of the following is highest melting halide? Show Answer


Q562) The correct order of increasing bond angles in the following triatomic species is: Show Answer


Q563) As the s-character of hybridization orbitals increases, the bond angle: Show Answer


Q564) Which one of the following is a correct set with respect to molecule, hybridisation and shape? Show Answer


Q565) The correct order of decreasing polarity is Show Answer


Q566) The process requiring the absorption of energy is: Show Answer


Q567) Among the following metals interatomic forces are probably weakest in: Show Answer


Q568) Which of the following phenomenon will occur when two atoms of an element with same spin of electron in orbitals approach each other? Show Answer


Q569) If the bond has zero per cent ionic character, the bond is: Show Answer


Q570) The species having bond order different from that in CO is Show Answer


Q571) The species having octahedral shape is: Show Answer


Q572) Which of the following will show least dipole moment? Show Answer


Q573) Which has the minimum bond energy? Show Answer


Q574) The polarising ability of which one of the following is highest? Show Answer


Q575) Which is expected to show paramagnetism? Show Answer


Q576) Highest covalent character is found in which of the following? Show Answer


Q577) The molecule which has zero moment is Show Answer


Q578) Hydrogen bond is strongest in Show Answer


Q579) The only molecule having dipole moment is Show Answer


Q580) Two lone pairs of electrons and two bond pairs are present in: Show Answer


Q581) The increase in bond order results in: Show Answer


Q582) Which is not characteristic of π-bond? Show Answer


Q583) Which species has the highest bond order? Show Answer


Q584) The correct sequence of hybridisation of methane, ethene and acetylene is Show Answer


Q585) The nature of the bond in diamond is Show Answer


Q586) The set representing the correct order of first ionization potential is: Show Answer


Q587) Amongst the following, the molecule that is linear is Show Answer


Q588) Which of the following species does not exist under normal conditions? Show Answer


Q589) Octet rule is not valid for the molecule: Show Answer


Q590) Concept of bond order in the molecular orbital theory depends on the number of electrons in the bonding and antibonding orbitals. The bond order: Show Answer


Q591) The Cl—C—Cl angle in 1, 1, 2, 2-tetrachloroethene and tetrachloromethane respectively will be about: Show Answer


Q592) Which set has strongest tendency to form anions? Show Answer


Q593) In a crystal, the atoms are located at the positions of: Show Answer


Q594) Which substance has the greatest ionic character? Show Answer


Q595) The conductivity of the metal decreases with increases in temperature because Show Answer


Q596) Which of the following when dissolved in water forms a solution, i.e., non-conducting? Show Answer


Q597) Which bond is more polar? Show Answer


Q598) The pairs of bases in DNA are held together by: Show Answer


Q599) Which of the following has highest bond angle? Show Answer


Q600) For the type of interactions; (I) Covalent bond, (II) van der Waals’ forces, (III) Hydrogen bonding, (IV) Dipole-dipole interaction, which represents the correct order of increasing stability? Show Answer


Q601) The hydrogen bonding is strongest in: Show Answer


Q602) The correct increasing order of polarising power is: Show Answer


Q603) Acetate ion contains: Show Answer


Q604) Which one is paramagnetic and has the bond order half (0.5)? Show Answer


Q605) Which one is correct? Show Answer


Q606) IP is influenced by: Show Answer


Q607) Which of the following has lowest boiling point? Show Answer


Q608) When metals react with non-metals, the metal atoms tend to Show Answer


Q609) Which one has more tendency to form covalent compounds? Show Answer


Q610) The order of melting point of ortho, para, meta-nitrophenol is Show Answer


Q611) The hybridization of carbon in diamond, graphite and acetylene is: Show Answer


Q612) The molecule, ion which is pyramidal in shape is Show Answer


Q613) C-C bond order in benzene is Show Answer


Q614) For the formation of covalent bond, the difference in the value of electronegativities should be: Show Answer


Q615) Which among the following elements has lowest value of ionisation energy? Show Answer


Q616) In coordinate bond, the acceptor atoms must essentially contain in its valency shell an orbitals: Show Answer


Q617) Paramagnetism of oxygen is explained on the basis of its electronic configuration of Show Answer


Q618) The compound possessing most strongly ionic nature is: Show Answer


Q619) The complex ion which has no ‘d’ electrons in the central metal atom is: Show Answer


Q620) Which of the following species is least stable? Show Answer


Q621) Which group of atoms have nearly same atomic radius? Show Answer


Q622) Bond polarity of diatomic molecule is because of Show Answer


Q623) Which contains a coordinate and covalent bond? Show Answer


Q624) Covalent radius of Li is 123 pm. The crystal radius of Li will be: Show Answer


Q625) Which of the following does not contain coordinate bond? Show Answer


Q626) With increasing bond order, stability of a bond Show Answer


Q627) Molecular orbitals theory was proposed by: Show Answer


Q628) The isoelectronic pair is Show Answer


Q629) The compound 1,2-butadiene has Show Answer


Q630) The correct order of ionic radii is: Show Answer


Q631) The shape of sulphate ion is Show Answer


Q632) Sodium chloride is soluble in water but not in benzene because Show Answer


Q633) The pair likely to form the strongest hydrogen bonding: Show Answer


Q634) The number of sigma and pi bonds in 1- butane 3-yne are: Show Answer


Q635) Which is soluble in water? Show Answer


Q636) Which of the following compounds has the lowest melting point? Show Answer


Q637) Which of the following is false? Show Answer


Q638) The pair of elements which on combination are most likely to form an ionic compound is: Show Answer


Q639) Among the following the maximum covalent character is shown by the compound. Show Answer


Q640) Dipole-dipole attractive forces are strongest between the molecules of: Show Answer


Q641) The electrons used in bonding atoms: Show Answer


Q642) In a homonuclear molecule which of the following set of orbitals is degenerate? Show Answer


Q643) The electronegativity order of O, F, Cl and Br is: Show Answer


Q644) Solid NaCl is a bad conductor of electricity because: Show Answer


Q645) CaO and NaCl have the same crystal structure and approximately the same ionic radii. If U is the lattice energy of NaCl, the approximate lattice of CaO is Show Answer


Q646) The double bonds between the two carbon atoms in ethylene consists of: Show Answer


Q647) In which pair, the first atom or ion is not larger than the second? Show Answer


Q648) The maximum number of hydrogen bonds that a molecule of water can have is Show Answer


Q649) Dipole moment is exhibited by: Show Answer


Q650) In a multi-electron atom, the energy of a 2 p-orbital is: Show Answer


Q651) Ionization energy of nitrogen is more than oxygen because: Show Answer


Q652) The high melting point and insolubility in organic solvents of sulphanilic acid are due to its---structure Show Answer


Q653) Which of the following does not have a coordinate bond? Show Answer


Q654) Which of the following sequence regarding ionisation potential of coinage metal is correct: Show Answer


Q655) Which, molecule has zero dipole moment? Show Answer


Q656) Hybridisation of the underline atom changes in Show Answer


Q657) Which molecule has hydrogen bonding Show Answer


Q658) The energy released when a neutral gaseous atom takes up an electron is called: Show Answer


Q659) The decreasing order of the second ionization energy of K, Ca and Ba is: Show Answer


Q660) Compound X is anhydride of sulphuric acid. The number of σ bonds and the number of π - bonds present in X are, respectively. Show Answer


Q661) Which is not true in case of ionic bond? Show Answer


Q662) Strongest hydrogen bond is present in Show Answer


Q663) In the cyanide ion, the formal negative charge is on: Show Answer


Q664) The trigonal bipyramidal geometry results from the hybridisation Show Answer


Q665) Which one of the following molecules has the smallest bond angle? Show Answer


Q666) Which of the following is non – linear molecule? Show Answer


Q667) Which contains both covalent and ionic bonds? Show Answer


Q668) In the formation of NaCl by combination of Na and Cl: Show Answer


Q669) Which of the following has linear structure? Show Answer


Q670) The lowest ionization energy would be associated with the electronic structure: Show Answer


Q671) Which is correct in the following? Show Answer


Q672) Which one of the following compounds has the smallest bond angle in its molecule? Show Answer


Q673) In which of the following ionisation processes, the bond order has increased and the magnetic behaviour has changed? Show Answer


Q674) The size of ionic species is correctly given in the order: Show Answer


Q675) Which of the following has the minimum bond length? Show Answer


Q676) In acetylene molecule, between the carbon atoms there are Show Answer


Q677) Bond order of 1.5 is shown by: Show Answer


Q678) In which of the process, the bond order increases and magnetic behaviour changes? Show Answer


Q679) Which involves a bond forming process? Show Answer


Q680) Which is paramagnetic? Show Answer


Q681) Which one of the following pairs of molecules will have permanent dipole moments for both members? Show Answer


Q682) The correct order towards bond angle is Show Answer


Q683) Which of the following is a linear molecule? Show Answer


Q684) Which involves breaking of covalent bond? Show Answer


Q685) For the four successive transition elements (Cr, Mn, Fe and Co), the stability of +2 oxidation state will be there in which of the following order? Show Answer


Q686) An element X has 3 electrons in p-orbitals and also belongs to III period. Its molecular formula should be: Show Answer


Q687) Elements having six electrons in its outermost orbit generally form: Show Answer


Q688) Oxygen is divalent, but sulphur exhibits variable valency of 2, 4 and 6, because: Show Answer


Q689) Of the following sets which one does not contain isoelectronic species? Show Answer


Q690) Which transition involves maximum amount of energy? Show Answer


Q691) Maximum covalence of an atom of an element is equal to: Show Answer


Q692) Which main group elements have a different number of outermost electrons than their group number? Show Answer


Q693) The forces present in the crystals of naphthalene are: Show Answer


Q694) Which does not show inert pair effect? Show Answer


Q695) The electronic theory of bonding was proposed by Show Answer


Q696) The correct order of decreasing first ionization potential is: Show Answer


Q697) Which of the following is more ionic? Show Answer


Q698) The species showing pπ-dπ overlapping is: Show Answer


Q699) Among the following which is the strongest oxidising agent? Show Answer


Q700) Which of the following molecule in its valence shell has three bond pairs of electrons and one lone pair of electrons? Show Answer


Q701) Which of the following statements is correct? Show Answer


Q702) The formation of energy bonds in solids are in accordance with Show Answer


Q703) Which of the following configuration is associated with biggest jump between 2nd and 3rd IE ? Show Answer


Q704) The predominent intermolecular forces in hydrogen fluoride is due to: Show Answer


Q705) Correct order of bond length is Show Answer


Q706) Which of the following molecules has pyramidal shape? Show Answer


Q707) In which of the following arrangement the order is not correct according to property indicated against it? Show Answer


Q708) Most covalent halide of aluminium is: Show Answer


Q709) The bond order of individual carbon-carbon bonds in benzene is: Show Answer


Q710) The percentage s – character of the hybrid orbitals in methane, ethene and ethyne are respectively Show Answer


Q711) Which pair represents isostructural species? Show Answer


Q712) In which of the following species, all the three types of hybrid carbons are present? Show Answer


Q713) Which statement is not correct? Show Answer


Q714) The pair having similar geometry is: Show Answer


Q715) Which of the following is largest? Show Answer


Q716) Alkali metals in each period have: Show Answer


Q717) Valency means: Show Answer


Q718) Which does not form two or more chlorides? Show Answer


Q719) Which has the largest first ionisation energy? Show Answer


Q720) Polarization of electrons in acrolein may be written as: Show Answer


Q721) Which bond has the highest bond energy? Show Answer


Q722) In which of the following molecules the van der Waals’ forces is likely to be the most important in determining the melting and boiling point? Show Answer


Q723) The higher values of specific heat of water in comparison to other liquids is due to: Show Answer


Q724) Which contains both polar and non-polar covalent bonds? Show Answer


Q725) How many – bonds are present in naphthalene? Show Answer


Q726) If the electron pair forming a bond between two atoms A and B is not in the centre, then the bond is Show Answer


Q727) Which of the following species in non-linear? Show Answer


Q728) The bond order of CO molecule on the basis of molecular orbital theory is: Show Answer


Q729) Which one is the strongest bond? Show Answer


Q730) Which of the following compound has maximum volatility? Show Answer


Q731) Hybridisation shown by carbon and oxygen of –OH group in phenol are respectively Show Answer


Q732) The molecule which has pyramidal shape is: Show Answer


Q733) The correct increasing bond angles order is: Show Answer


Q734) Van der Waals’ forces are applied to: Show Answer


Q735) Which shows the least dipole moment? Show Answer


Q736) Which force is strongest? Show Answer


Q737) Which molecule has linear structure? Show Answer


Q738) Which ion has a higher polarizing power? Show Answer


Q739) The solubility of KCl is relatively more in (where D is dielectric constant): Show Answer


Q740) Elements have electronegativities 1.2 and 3.0, bond formed between them would be Show Answer


Q741) Among the following, the pair in which the two species are not isostructural, is Show Answer


Q742) Which has zero dipole moment? Show Answer


Q743) Which of the following molecules is covalent and shows expanded octet in its formation? Show Answer


Q744) Which one of the following is a correct set? Show Answer


Q745) Which property of halogens increases from F to I? Show Answer


Q746) The total number of bonds in acetylene molecule is: Show Answer


Q747) Variable valency is characteristic of: Show Answer


Q748) In which molecule all atoms are coplanar? Show Answer


Q749) Bond energy of covalent O—H bond in water is: Show Answer


Q750) Which one of the following has a coordinate bond? Show Answer


Q751) Which carbon is more electronegative? Show Answer


Q752) Paramagnetism is exhibited by molecules: Show Answer


Q753) Which molecule has the largest dipole moment? Show Answer


Q754) The intermolecular attractive forces vary in the order: Show Answer


Q755) Which of the following species has a linear shape? Show Answer


Q756) Which of the following will provide the most efficient overlap? Show Answer


Q757) Four diatomic species are listed below in different sequences. Which of these represents the correct order of their increasing bond order? Show Answer


Q758) Which one species has the longest bond length? Show Answer


Q759) The pair of molecules forming strongest hydrogen bonds are Show Answer


Q760) Which one of the following has not triangular pyramidal shape? Show Answer


Q761) A covalent bond is formed between the atoms by the overlapping of orbitals containing: Show Answer


Q762) Which of the following bonds required the largest amount of bond energy to dissociate the atom concerned? Show Answer


Q763) Which is distilled first? Show Answer


Q764) Which one of the following is a correct set? Show Answer


Q765) Which is correct order for electron gain enthalpy? Show Answer


Q766) Which is a pyramidal structure? Show Answer


Q767) Among the following mixtures, dipole – dipole as the major interaction, is present in Show Answer


Q768) In dry ice there are … in between molecules. Show Answer


Q769) The dipole moment of o,p and m-dichlorobenzene will be in the order Show Answer


Q770) Which formulae does not correctly represents the bonding capacity of the atom involved? Show Answer


Q771) Which has minimum ionic radius? Show Answer


Q772) The bond order is maximum in Show Answer


Q773) Resonance is due to: Show Answer


Q774) Which property is commonly exhibited by a covalent compound? Show Answer


Q775) Which of the following is an electrovalent linkage? Show Answer


Q776) Which metal has a greater tendency to form metal oxide? Show Answer


Q777) A p -block element in which last electron enters into s-orbitals of valence shell instead of p -orbital is: Show Answer


Q778) How many electron pairs are present in valence shell of oxygen in water molecule? Show Answer


Q779) Number of electrons in a the valence orbit of nitrogen in an ammonia molecule is Show Answer


Q780) The number of valency electrons in carbon atom is: Show Answer


Q781) Which one among the following does not have the hydrogen bond? Show Answer


Q782) Which of the following molecules/ions does not contain unpaired electrons. Show Answer


Q783) The C-O-H bond angle in ethanol is nearly Show Answer


Q784) Among the following elements Ca,Mg,P and Cl the order of increasing atomic radius is: Show Answer


Q785) Which has a giant covalent structure? Show Answer


Q786) Amongst the elements with following electronic configurations, which one of them may have the highest ionization energy? Show Answer


Q787) Which one of the following elements has lower value of ionisation energy? Show Answer


Q788) The lattice energy order for lithium halide is: Show Answer


Q789) Peroxide ion
(i) has five completely filled antibonding molecular orbitals
(ii) is diamagnetic
(iii) has bond order one
(iv) is isoelectronic with neon
Which one of these is correct?
Show Answer


Q790) Which is the weakest among the following type of bond? Show Answer


Q791) Bond length decreases with: Show Answer


Q792) Which of the following molecules/ ions does not contain unpaired electrons? Show Answer


Q793) In which of the following bond angle is maximum? Show Answer


Q794) The hybridisation of the ipso – carbon dichlorobenzene is Show Answer


Q795) Which of the following has maximum dipole moment? Show Answer


Q796) The molecule having largest dipole moment among the following is Show Answer


Q797) Which of the following diatomic molecules would be stabilized by the removal of an electron? Show Answer


Q798) Which of the following possess maximum hydration energy? Show Answer


Q799) In which of the following hydrogen bond is present? Show Answer


Q800) The correct order of decreasing polarisability of ion is: Show Answer


Q801) Which is highest melting point halide? Show Answer


Q802) Number of σ and π bonds in acetylene are Show Answer


Q803) Which of the following halides is least stable and has doubtful existence? Show Answer


Q804) C-C bond length is maximum in Show Answer


Q805) Resonance is not shown by: Show Answer


Q806) In which of the following compounds, the bonds have the largest percentage of ionic character: Show Answer


Q807) The linear structure is possessed by: Show Answer


Q808) Which species has the maximum number of lone pair of electrons on the central atom? Show Answer


Q809) Which concept best explains that o-nitrophenol is more volatile than p-nitrophenol? Show Answer


Q810) The comparatively high b.p. of HF is due to Show Answer


Q811) Which one of the following species is diamagnetic in nature? Show Answer


Q812) The unequal sharing of bonded pair of electrons between two atoms in a molecule gives rise to: Show Answer


Q813) In which of the following process energy is liberated? Show Answer


Q814) Identify the least stable ion amongst the following: Show Answer


Q815) The lowest bond energy exist in the following bonds for: Show Answer


Q816) Which one is electron deficient compound? Show Answer


Q817) Pauling’s electronegativity values for elements are useful in predicting: Show Answer


Q818) It is thought that atoms combine with each other such that the outermost orbit acquires a stable configuration of 8 electrons. If stability were attained with 6 electrons rather than with 8, what would be the formula of the stable fluoride ions? Show Answer


Q819) Which has triangular planar shape? Show Answer


Q820) Which of the following molecule has highest bond energy? Show Answer


Q821) Which one of the following pairs of species have the same bond order? Show Answer


Q822) Which hybridization results non-polar orbitals? Show Answer


Q823) The element with strong electropositive nature is: Show Answer


Q824) Which statement is correct? Show Answer


Q825) Which one of the following sets of ions represents a collection of isoelectronic species? Show Answer


Q826) Which molecule has zero dipole-moment? Show Answer


Q827) Four diatomic species are listed below. Identify the correct order in which the bond order is increasing in them: Show Answer


Q828) Which one of the following compounds has bond angle as nearly 90°? Show Answer


Q829) In which of the following pair both molecules do not possess same type of hybridisation? Show Answer


Q830) Which is the most covalent? Show Answer


Q831) Which of the ions has the largest ionic radius? Show Answer


Q832) Which of the following is not isoelectronic? Show Answer


Q833) In which set of molecules are all the species paramagnetic? Show Answer


Q834) Which of the following has strongest hydrogen bonding? Show Answer


Q835) The angle between two covalent bonds is maximum in: Show Answer


Q836) The pair having similar geometry is Show Answer


Q837) In the electronic structure of acetic acid there are: Show Answer


Q838) Increasing order (lower first) of size of the various hybridised orbitals is: Show Answer


Q839) Among the following, the compound that contains ionic, covalent and coordinate linkage is Show Answer


Q840) The bond length is maximum in: Show Answer


Q841) Which of the following has maximum number of lone pairs associated with Xe? Show Answer


Q842) Which is most volatile compound? Show Answer


Q843) In which of the following pairs bond angle is 109 ͦ28′ ? Show Answer


Q844) Which of the following molecules has three-fold axis of symmetry? Show Answer


Q845) In which of the following arrangements the sequence is not strictly according to the property written against it? Show Answer


Q846) Which one of the following is paramagnetic? Show Answer


Q847) Which of the following has largest ionic radius? Show Answer


Q848) Lattice energy of a solid increases if Show Answer


Q849) Which one is most polar? Show Answer


Q850) The high boiling point of water is due to: Show Answer


Q851) In which pair of species, both species do have the similar geometry? Show Answer


Q852) Which of the following is largest ion? Show Answer


Q853) The electronic configuration of sodium and chlorine justifies: Show Answer


Q854) Glycerol is more viscous than ethanol due to Show Answer


Q855) In the case of alkali metals, the covalent character decreases in the order: Show Answer


Q856) Two nodal planes are present in Show Answer


Q857) H – bond is not present in Show Answer


Q858) In which of the following pairs molecules have bond order three and are isoelectronic? Show Answer


Q859) Which of the following halides has maximum melting point? Show Answer


Q860) Which atomic orbital is always involved in sigma bonding only? Show Answer


Q861) Which of the following acts sometimes as a metal and sometimes as a non-metal? Show Answer


Q862) Amongst the following elements the configuration having the highest ionization energy is: Show Answer


Q863) Which of the following species exhibits the diamagnetic behaviour ? Show Answer


Q864) Which is a good solvent for ionic and polar covalent compounds? Show Answer


Q865) The following salt shows maximum covalent character Show Answer


Q866) Each of the followings has non-zero dipole moment, except: Show Answer


Q867) Resonance structures can be written for Show Answer


Q868) Born-Haber cycle may be used to calculate Show Answer


Q869) In which element shielding effect is not possible? Show Answer


Q870) Which of the following is isoelectronic with carbon atom? Show Answer


Q871) Which of the following statement is correct? Show Answer


Q872) The value of bond order in nitrogen and oxygen molecule is: Show Answer


Q873) Pauling received Nobel Prize for his work on: Show Answer


Q874) The enhanced force of cohesion in metals is due to: Show Answer


Q875) Among HX, the maximum dipole moment is of: Show Answer


Q876) Dative bond is present in: Show Answer


Q877) Which has an odd electron and shows paramagnetic character? Show Answer


Q878) Which species is paramagnetic? Show Answer


Q879) Structure of ammonia is Show Answer


Q880) The example of the p-p-orbital overlapping is the formation of: Show Answer


Q881) In which of the following pπ - dπ bonding is observed? Show Answer


Q882) Which has the lowest bond angle? Show Answer


Q883) The energy of antibonding molecular orbitals is: Show Answer


Q884) The set representing the correct order of ionic radius is: Show Answer


Q885) Which of the following hydrogen bonds is the strongest? Show Answer


Q886) Which of the following statements is most correct? Effective nuclear charge of an atom depends on: Show Answer


Q887) Phosphoric acid is syrupy in nature due to Show Answer


Q888) The correct order of bond angles is: Show Answer


Q889) Metallic lusture is explained by Show Answer


Q890) Which of the following phenomenon will occur when two atoms of same spin will react? Show Answer


Q891) Among the following the pair in which the two species are not isostructural is Show Answer


Q892) Which of the following species contains three bond pairs and one lone pair around the central atom? Show Answer


Q893) Intramolecular hydrogen bonding is found in: Show Answer


Q894) Ice has an open structure compared to water due to which it floats on water and occupies a greater volume of space. The open structure of ice is due to: Show Answer


Q895) Which of the following has minimum melting point? Show Answer


Q896) Geometry of ammonia molecule and the hybridisation of nitrogen involved in it are Show Answer


Q897) The molecule having smallest bond angle is Show Answer


Q898) For a covalent solid, the units which occupy lattice points are: Show Answer


Q899) The ionization energy will be maximum for the process: Show Answer


Q900) Born Haber cycle is used to determine: Show Answer


Q901) Which of the following element has higher ionisation energy? Show Answer


Q902) In a double bond connecting two atoms there is a sharing of: Show Answer


Q903) Elements whose electronegativities are 1.2 and 3.0 form: Show Answer


Q904) Which of the following is correct? Show Answer


Q905) Which of the following is a favourable factor for cation formation? Show Answer


Q906) Ionisation potential values of ‘d’ block elements as compared to ionisation potential values of ‘f’ block elements are: Show Answer


Q907) When a metal atom combines with a non-metal atom, the non-metal atom will Show Answer


Q908) The hydration of ionic compounds involves: Show Answer


Q909) Which of the following is diamagnetic? Show Answer


Q910) According to Fajan’s rule polarization is more when: Show Answer


Q911) Organic compounds soluble in water contain: Show Answer


Q912) Atomic radii of fluorine and neon in angstrom unit are respectively given by: Show Answer


Q913) The decreasing order of bond angle is Show Answer


Q914) The correct order of dipole moment is: Show Answer


Q915) Which of the following molecules does not possess a permanent electric dipole moment? Show Answer


Q916) Among O, C, F, Cl, Br the correct order of increasing atomic radii is: Show Answer


Q917) In which of the following diatomic molecules /ions is the bond order of each molecule/ion =2.5? Show Answer


Q918) Debye an unit of dipole moment is of the order of: Show Answer


Q919) Which of the following is a favourable factor for cation formation? Show Answer


Q920) The paramagnetic molecule at ground state among the following is Show Answer


Q921) The bond in the formation of fluorine molecule will be Show Answer


Q922) The diamagnetic molecules are: Show Answer


Q923) In the following, which bond will be responsible for maximum value of hydrogen bond? Show Answer


Q924) The fHOMO in CO is Show Answer


Q925) Coordinate compounds are formed by: Show Answer


Q926) Which shows non-directional bonding? Show Answer


Q927) Which one of the following contains both ionic and covalent bonds? Show Answer


Q928) Which of the following does not apply to metallic bond? Show Answer


Q929) Van der Waals’ forces are maximum in: Show Answer


Q930) The molecule having zero dipole moment is Show Answer


Q931) For a stable molecule, the value of bond order must be Show Answer


Q932) Which compound among the following has more covalent character? Show Answer


Q933) Which among the following has the largest dipole moment? Show Answer


Q934) A square planar complex is formed by hybridisation of the following atomic orbitals Show Answer


Q935) Which of the following pairs are isostructural? Show Answer


Q936) Hydration of different ions in aqueous solution is an example of Show Answer


Q937) Atoms or group of atoms which are electrically charged are known as: Show Answer


Q938) Which among the following elements has lowest value of ionisation energy? Show Answer


Q939) Which one pair of atoms or ions will have same configuration? Show Answer


Q940) Which combination is best explained by the coordinate covalent bond? Show Answer


Q941) Which shows the highest lattice energy? Show Answer


Q942) The correct order regarding the electronegativity of hybrid orbitals of carbon is: Show Answer


Q943) Which of the following compounds does not follow the octet rule for electron distribution? Show Answer


Q944) Which of the following sets represents the collection of isoelectronic species? Show Answer


Q945) Which of the following has unchanged valency? Show Answer


Q946) Which molecule has trigonal planar geometry? Show Answer


Q947) Malleability and ductility of metals can be accounted due to Show Answer


Q948) Hydrogen fluoride is a liquid unlike other hydrogen halides because: Show Answer


Q949) The number of sigma (σ)and pi (π) covalent bonds respectively in banzene nitrile are Show Answer


Q950) In which one of the following cases, breaking of covalent bond takes place? Show Answer


Q951) Which compound is soluble in water Show Answer


Q952) Which statement is true? Show Answer


Q953) Which compound does not contain double bond or triple bond? Show Answer


Q954) The compound showing maximum covalent character is: Show Answer


Q955) Which statement is wrong? Show Answer


Q956) Among the following, the paramagnetic compound is Show Answer


Q957) HCl molecule in the vapour state is an example of: Show Answer


Q958) The electrons in an incomplete outershell are known as: Show Answer


Q959) The element which exists in both hard and soft form is: Show Answer


Q960) Which of the following is not a correct statement? Show Answer


Q961) The bond strength increases: Show Answer


Q962) Which has higher bond energy and stronger bond? Show Answer


Q963) Which of the following statements regarding carbon monoxide is correct? Show Answer


Q964) Which of the following is having highest bond length? Show Answer


Q965) Which does not have pyramidal geometry? Show Answer


Q966) Which of the following oxides is not expected to react with sodium hydroxide? Show Answer


Q967) How many medal india win in Singapore Weightlifting International ? Show Answer


Q968) How many gold medal india win in Singapore Weightlifting International ? Show Answer


Q969) National Science Day is celebrated on Show Answer


Q970) Which countries abstained from voting on UNSC resolution against Russia's invasion of Ukraine? Show Answer