Practice Test


1) Most stable configuration is the configuration of


2) Atoms combine to form molecules because


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


4) Valency expresses


5) Valence electrons are those present in


6) Combination of atoms takes place because


7) Valency of an atom with electronic configuration 2,8,8,1 is


8) When a molecule is formed by the combination of two atoms


9) According to octet theory during bond formation


10) Bond formed between two unlike atom is


11) Melting and boilling point of ionic compounds are


12) The type of bond between two atoms depends upon


13) In the formation of magnesium chloride molecule


14) 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


15) Electronegativities of atoms give information about


16) Electropositive atom forms anion by


17) Electronegative element forms an ion by


18) Ionic bond involves


19) Which of the following statement regarding covalent bonding is false?


20) In a double bond formed between two atoms number of shared electrons are


21) Bond formed between like atoms is


22) Convalent bond involves


23) Bond between Cl-Cl is a


24) A pure covalent bond is formed with element having


25) Maximum number of bonds between two atoms of a convalent bond can be


26) An example for a diatomic molecule having double bonds between its atoms is


27) Chlorine atoms combine to form chlorine molecule because it


28) Electron deficient molecules are those, which are formed by


29) During bond formation normally all the elements in their outermost shell acquire


30) Bond order is defined as


31) Bond order is


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


33) 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?


34) 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


35) Which of the following condition is NOT correct for resonating structures?


36) What is NOT true about resonance?


37) Covalent compounds dissolve in


38) Carbon tetrachloride has NO net dipole moment because of


39) Electronegativity values of elements help in predicting


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


41) Which of the following bonds will be the most polar?


42) A hydrogen-halogen (H-X) bond is polar since


43) The unit of dipole moment is


44) Ionic compound dissolve in


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


46) Chlorine molecule is formed by the


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


48) An atomic orbital not having a particular direction in space is


49) H- X bond is formed due to


50) s-p overlap is defined as the overlapping between


51) Fluorine molecule is formed by


52) Hybridization involves


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


54) Choose the correct statement


55) In Be, how many electrons are available for bonding, according to VBT?


56) The weakest bond among the following is


57) The number of unhybridized orbitals in an acetylene molecule is


58) The molecule with the shortest distance between the two adjacent carbon atoms is


59) Number of lone pair of electrons in ethene and borontrifluoride are______ and _______ respectively.


60) Methane molecule contains ________ lone pairs and _____ bond pairs.


61) In a homologous series, the percentage of 's' character


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


63) 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


64) 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


65) Which of the following statement is not correct regarding bonding molecular orbitals?


66) Which of the following theory provides good explanation about the paramagnetic behaviour of oxygen?


67) Antibonding molecular orbital is formed by


68) The bond formed in fluorine molecule is


69) H- bonding is exhibited by


70) Density of ice is less than that of water because of


71) Strongest hydrogen bond is shown by


72) Electronic configuration of an element is 2, 8, 8, 2. Its valency will be


73) Ionic bonds are formed between


74) A bond with maximum covalent character in non-metallic elements is found between


75) A hydrogen molecule is formed between two hydrogen atoms, only when


76) According to Molecular orbital theory ______.


77) There is no hydrogen bonding in


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


79) The compound with zero dipole moment is


80) For a stable molecule the value of bond order should be


81) The electron dot representations of covalent molecules is also


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


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


84) Which of the following is ionic compound?


85) Which of the following is a covalent compound?


86) Which one of the following is an electron deficient compound?


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


88) Which of the following is the electron deficient molecule?


89) Which of the following have odd number of electrons?


90) Resonance structure can be written for


91) Which of the following molecule is non polar?


92) LiI is more covalent than LiCl due to presence of


93) The p-p orbital overlap is present in


94) Which of the following statement is WRONG?


95) Which of the following will provide the most efficient overlap?


96) A hybrid orbital formed from s and p-orbital can contribute to


97) Square planar molecules undergo_______ hybridization


98) Which of the following molecule is T-shaped?


99) A sigma bond is formed by overlapping of


100) Which of the following molecule has a linear shape?


101) Which of the following molecules does not contain a lone pair of electrons?


102) Which carbon is most electronegative?


103) Formaldehyde molecule contains


104) Which of the following molecule possesses pyramidal structure?


105) In the excited state an electron from 2s orbital of beryllium jumps to


106) Formation of an excited state will NOT be observed in the hybridization for the for formation of


107) Which of the following molecule has two p-orbitals unused?


108) Molecule having one lone pair of electron is


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


110) In which of the following is the angle between the two covalent bonds greatest?


111) On hybridization of one s and one p orbital we get,


112) Which of the following cannot exist on the basis of MO theory?


113) Which of the following is paramagnetic?


114) The oxygen molecule contains


115) A diatomic molecule is not formed for


116) Which of the following molecules has one lone pair of electrons on the central atom?


117) Which of the following molecule has net dipole moment?


118) The carbon monoxide molecule may be represented by the following structures except


119) Which of the following is the electronic configuration of nitrogen atom in the excited state?


120) In a double bond connecting two atoms there is a sharing of


121) Pi bond is formed by the overlapping of


122) Which of the following bonds is the most ionic ?


123) Which of the following contains both covalent and ionic bonds ?


124) In which of the compounds, there is an electrovalent linkage ?


125) Sulphuric acid molecule contains


126) Which of the following contains a coordinate covalent bond ?


127) Hydrogen chloride molecule contains


128) How many sigma and pi bonds are present in tetracyanoethylene ?


129) Which of the following substance has the least ionic character ?


130) Which chloride should exhibit the most covalent type of bond ?


131) Carbon dioxide is isostructural with which of the following ?


132) The correct order of decreasing polarisability of the ion is


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


134) How many sigma and pi - bonds are present in toluene ?


135) Sulphuric acid provides a simple example of


136) The correct order of the lattice energies of the following ionic compounds is


137) Which of the following does not contain coordinate bond ?


138) Which of the following is least ionic ?


139) A bond with maximum covalent character between non-metallic element is found


140) Covalent compounds are soluble in


141) The bond between two identical non metal atoms has a pair of electrons


142) In covalent bond


143) Which of the following factors do not have favour electrovalency ?


144) Among all alkaline earth metals the element forming predominantly covalent compound is


145) Fluorine molecule is formed by


146) Which of the following has covalent as well as ionic valency ?


147) Which of the following is least ionic ?


148) According to Fajan's rule, covalent bond is favoured by


149) 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


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


151) Which of the following is electron deficient ?


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


153) In which of the following molecules is the covalent bond most polar ?


154) Covalent compounds have low melting points because


155) Chemical bond implies


156) A lone pair of electrons in an atom implies


157) Sodium chloride is an ionic compound whereas hydrogen chloride is mainly covalent because


158) The number and types of bonds between carbon atoms in calcium carbide are


159) Of the following sets which does not contain isoelectronic species ?


160) Which of the following is electron deficient molecule ?


161) Correct sequence of increasing covalent character is represented by


162) The compound which contains both ionic and covalent bonds is


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


164) Which of the following compounds is covalent ?


165) Which ion is isoelectronic with CO ?


166) The enolic form of acetone has


167) Which is most ionic ?


168) Which of the following statements is not correct ?


169) In which of the following the angle between the two covalent bonds is largest ?


170) Which has the minimum bond angle ?


171) The pyramidal geometry is associated with


172) Which one of the following has tetrahedral disposition ?


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


174) Which of the following molecules is linear ?


175) The octahedral shape is associated with


176) The hybrid state of carbon is diamond, graphite and acetylene are respectively.


177) Which overlap is involved in HCl molecule ?


178) Which of the following molecule / ions has triangular pyramidal shape ?


179) Which of the following pairs contains iso - structural species ?


180) Directed bond in water forms an angle of nearly


181) The angles between covalent bonds is maximum in


182) One of the following is having square planar structure


183) According to VSEPR theory, the shape of the water molecule is


184) Which of the following is planar ?


185) which of the following will be octahedral ?


186) Carbon atoms in benzene molecule are inclined at an angle of


187) Polarisation of electrons in acrolein may be written as


188) Which one of the following molecules will have unequal bond lengths ?


189) Most efficient overlaping is


190) Slidewise overlap of p - p orbitals forms


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


192) Berylium atom in berylium fluoride is


193) Structure of ammonia is


194) Which of the following has unchanged valency ?


195) The ion which is not tetrahedral in shape is


196) Which of the following is correct ?


197) Which one of the following has the smallest bond angle ?


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


199) Which carbon is more electronegative ?


200) In which of the following molecules the central atom does not follow the octet rule ?


201) Which one of the following molecule has the smallest bond angle ?


202) The ONO angle is maximum in


203) Among the following, the pair in which the two species are not isostructural is


204) On hybridisation of one s and p orbital we get


205) Which of the following is a linear molecule ?


206) Which of the following bonds is most polar ?


207) Which one of the following statement is true ?


208) Which of the following has zero dipole moment ?


209) Which of the following is polar ?


210) Which of the following molecules does not have dipole moment ?


211) Which of the following compound(s) is non-polar ?


212) Among the following compounds, which has a dipole moment ?


213) The dipole moment is the highest for


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


215) Which pair among the following is isostructural ?


216) In acetylene molecule, the two carbon atoms are linked by


217) A square planar complex is formed by hybridisation of which atomic orbitals ?


218) The decreasing order of bond angle is


219) Which of the following arrangement of molecules is correct on the basis of their dipole moments ?


220) The correct sequence of decrease in the bond angles of the following hybrides is


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


222) Lattice energy of an ionic compound depends upon


223) Which of the following would have a permanent dipole moment ?


224) The correct order in which O - O bond length increases in the following is


225) The octet rule is not valid for the molecule


226) Amongst the following molecules the one with the largest distance between the two adjacent carbon atoms is


227) Which of the following compounds has a linear structure ?


228) Dipole moment is shown by


229) Which one of the following halogens has the highest bond energy ?


230) Amongst the following the molecule that is linear is


231) The species which has pyramidal shape is


232) The molecular which has zero dipole moment is


233) Which contains both polar and non polar bonds ?


234) Which of the following, hydrocarbons has the lowest dipole moment ?


235) Among the following, the molecule with the highest dipole moment is


236) The compound which has maximum number of lone pairs of electrons on central atom is


237) Which of the following compounds can form hydrogen bond ?


238) Which of the following does not apply to bonding in metals ?


239) Which one of these is weakest ?


240) The high density of water compared to ice is due to


241) Which is most viscous ?


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


243) The boiling of para-nitrophenol is greater than that of ortho - nitrophenol, because


244) The boiling point of methanol is greater than methyl thiol because


245) H - bonding is not present in


246) Intermolecular forces in solid hydrogen are


247) The luster of the metal is on account of


248) The nature of inter - particle forces in benzene is


249) 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 ?


250) The maximum extent of H - bonding is shown by


251) Which of the following does not conduct electricity ?


252) The number of electrons that are paired in oxygen molecule is


253) The boiling point of heavy water is


254) Methanol and ethanol are miscible in water due to


255) The bond order of a molecule is given by


256) The bond angle H -O - H in ice is closest to


257) In a homonuclear molecule which of the following set of orbitals are degenerate ?


258) Other factors being constant which bond order is expected to correspond to shortest bond length ?


259) Which of the following is non - existent according to molecular orbital theory ?


260) The molecular species having highest bond order is


261) Which of the following is not paramagnetic ?


262) An ionic solid is a poor conductor of electricity because


263) Paramagnetism is exhibited by molecules which


264) Which of the following species is paramagnetic ?


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


266) What is the correct sequence of bond order ?


267) The molecule having bond order 3 is


268) Which of the following is not paramagnetic ?


269) Which of the following is paramagnetic ?


270) Which of the following hydrides has the lowest boiling point ?


271) Antibonding MO formed by


272) Two nodal planes are present in


273) Which one of the following species is diamagnetic in nature ?


274) Which of the following is soluble in water ?


275) Oxygen molecule is paramagnetic because


276) The molecule having one unpaired electron is


277) Hydrogen bonding is maximum in


278) Which of the following species is paramagnetic ?


279) Combination of two AOs leads to the formation of


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


281) Which of the following molecular species has unpaired electron(s) ?


282) Which of the following is not paramagnetic.


283) The pair of molecules forming strongest intermolecular hydrogen bonding are


284) Which of the following is not linear ?


285) Which of the following compounds, shows ionic, covalent and coordinate bonds ?


286) Which of the following is non - polar ?


287) Which of the following has no dipole moment ?


288) Which one of the following is highest melting halide ?


289) Which of the following is non - linear molecule ?


290) The polarising ability of which one of the following is highest ?


291) Which of the following molecules has pyramidal shape ?


292) Which of the following has covalent bond ?


293) Increasing order of electronegativity of the hybrid orbitals is


294) Among the following, shortest bond length is in


295) Pair of species having identical shapes for molecules is


296) Metallic luster is explained by


297) Which of the following represents isostructural pairs ?


298) Among the following, the pair in which the two species are not isostructural is


299) Which of the following molecules / ions does not contain unpaired electrons ?


300) Among the following mixtures, dipole - dipole as the major interaction, are present in


301) In which of the following molecules / ions are all the bonds not equal ?


302) Which of the following species exhibits the diamagnetic behaviour ?


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


304) Which of the following hydrogen bonds is the strongest ?


305) Which one of the following constitutes a group of the isoelectronic species ?


306) Using MO theory predict which of the following species has the shortest bond length ?


307) (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


308) The species having bond order different from that in CO is


309) Among the following, the paramagnetic compound is


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


311) Statement 1: NaCl is more ionic than NaI.
Statement 2: Chlorine is more electronegative than iodine.


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


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


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


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


316) Statement 1: F-F bond has low bond dissociation energy
Statement 2: The fluorine has low reactivity


317) Van der Waals’ forces between molecules depend upon:


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


319) Which has the largest distance between the carbon hydrogen atom?


320) Length of hydrogen bond ranges from 2.5Å to:


321) Which molecule is planar?


322) 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?


323) Maximum number of covalent bonds between two like atoms can be:


324) When sodium and chlorine react, energy is:


325) The element having lowest ionisation energy among the following is:


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


327) Which is electron deficient compound?


328) Which of the following is not correct regarding the properties of ionic compounds?


329) Which of the following is not tetrahedral?


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


331) In allene structure, three carbon atoms are joined by:


332) The carbon atom in graphite is:


333) Boron cannot form which one of the following anions?


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


335) Which one is the weakest bond?


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


337) The equilateral triangle shape has:


338) Which of the following has fractional bond order?


339) For which of the following hybridization the bond angle is maximum?


340) Stability of hydrides generally increases with:


341) Which can be described as a molecule with residual bonding capacity?


342) Lattice energy of an ionic compound depends upon


343) Among the following elements, the most electronegative is:


344) Metallic bonds do not play a role in:


345) Which p-orbitals overlapping would give the strongest bond?


346) When two atomic orbitals combine, they form:


347) The correct increasing covalent nature is:


348) Greater the dipole moment:


349) Which of the following molecular orbitals has two nodal planes?


350) Hydrogen bonding is maximum in


351) The O—H bond distance in water molecule is:


352) Which among the following molecules/ ions is diamagnetic?


353) The enolic form of acetone contains


354) Which of the following is paramagnetic with bond order 0.5?


355) Water has high heat of vaporization due to:


356) The C – H bond distance is the longest in


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


358) Polar covalent compounds are soluble in:


359) Which does not show hydrogen bonding?


360) Which among the following has highest ionic radius?


361) Zero dipole moment is possessed by


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


363) The incorrect statements regarding bonding molecular orbitals because:


364) A coordinate bond is a dative covalent bond. Which of the below is true?


365) 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?


366) Which of the following has largest size?


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


368) Which is expected to conduct electricity?


369) Metals are good conductors of electricity because they contain


370) The species having pyramidal shape is


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


372) In HCHO carbon atom has hybridisation:


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


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


375) In which of the following molecules are all the bonds not equal?


376) Which of the following compound is covalent?


377) Which of the following molecular species has unpaired electron (s)?


378) The correct order of bond angles is:


379) 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?


380) The molecule which does not exhibit dipole moment is


381) The correct order of radii is:


382) The bond order is maximum in:


383) Which of the following atoms has minimum covalent radius?


384) The screening effect of d-electrons is:


385) Which of the following statement is wrong?


386) The molecule having permanent dipole moment is:


387) Unusually high boiling point of water is result of


388) Which of the following is least ionic?


389) 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


390) Which one of the following is a non-polar molecule?


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


392) 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?


393) Which of the following is most stable?


394) Which one of the following pairs of species has the same bond order:


395) Which of the following characteristics regarding halogens is not correct?


396) The number of S – S bonds in sulphur trioxide is


397) The low density of ice compared to water is due to


398) Which of the following compounds has dipole moment approximately equal to that of chlorobenzene?


399) Which of the following overlaps leads to bonding?


400) Which of the following is correct?


401) The number of sigma and pi bonds in peroxodisulphuric acid are respectively


402) Which is not a paramagnetic species?


403) Electron deficient species are known as:


404) The molecule having three folds of axis of symmetry is:


405) Among the following the molecule with the highest dipole moment is


406) A molecule which cannot exist theoretically is:


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


408) Which one is polar molecule among the following?


409) Shape of molecules is decided by:


410) The shape of carbon dioxide is


411) The correct ionic radii order is:


412) Which is not linear?


413) Hybridisation of oxygen in diethyl ether is


414) What is the effect of more electronegative atom on the strength of ionic bond?


415) Which of the following two are isostructural?


416) Which molecule is linear?


417) Which of the following shows minimum melting point?


418) Which of the following does not have a lone pair on the central atom?


419) Molecular orbital theory was given by


420) Proton plays an important role in…bonding.


421) Which represents a collection of isoelectronic species?


422) An electrovalent compound does not exhibit space isomerism due to:


423) 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?


424) C-Cl bond is stronger than C –I bond, because


425) The ICl molecule is:


426) Which of the following silver salts is insoluble in water?


427) Silicon has 4 electrons in the outermost orbit. In forming the bond:


428) Chlorine atom tends to acquire the structure of:


429) Intramolecular hydrogen bond is present in


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


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


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


433) The electron affinity for inert gases is likely to be:


434) 1,3-butadiene has:


435) The bond between atoms of two elements of atomic number 37 and 53 is:


436) In methane the bond angle is


437) One would expect the elemental form of Cs at room temperature to be:


438) Which of the following is false?


439) Ionic radii are:


440) Which of the following statements is incorrect?


441) Which of the following pairs will from the most stable ionic bond?


442) Among NaF,NaCl NaBr and NaI, the NaF has highest melting point because:


443) Which of the following has regular tetrahedral shape?


444) Which of the following will have large dipole moment?


445) In which of the following pairs the two species are not isostructural?


446) The molecule having a pyramidal shape out of the following is


447) 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


448) The bond angle in ammonia molecule is


449) Which statement is wrong?


450) Which of the following molecules has three fold axis of symmetry?


451) Oxygen and the oxide ion have the


452) Valence bond theory of metallic bond was given by


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


454) The molecule which has T – shaped structure is


455) As a result of resonance:


456) The pair of species with the same bond order is:


457) Which of the following molecules has pentagonal bipyramidal shape?


458) The number of types of bonds between two carbon atoms in calcium carbide is


459) The bond angle between H—O—H in ice is closest to:


460) Which combination of atoms can form a polar covalent bond?


461) H-bonding is not present in:


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


463) The angle between the overlapping of one s-orbital and one p-orbital is:


464) Which is expected to have linear structure?


465) Carnallite in solution in water shows the properties of


466) A simple of a coordinate covalent bond is exhibited by


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


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


469) Identify the wrong statement in the following:


470) (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


471) Dipole moment is shown by


472) In which molecular are all atoms coplanar?


473) The compound with the maximum dipole moment among the following is:


474) Which of the following bonds require the largest amount of energy to dissociate the bond concerned?


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


476) Which have zero dipole moment?


477) Strongest bond is formed by the head on overlapping of:


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


479) Which has maximum covalent character?


480) Which species does not exist?


481) Among the following which has the highest cation to anion size ratio?


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


483) Ionization potential is lowest for:


484) The orbitals of same energy level providing the most efficient overlapping are:


485) The covalent compound HCl has the polar character because:


486) The increasing order of the ionic radii of the given isoelectronic species is:


487) Which cannot exist on the basis of M.O. theory?


488) Which of the following does not involve covalent bond?


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


490) During the formation of a chemical bond


491) Pair of species having identical shapes for molecules is


492) An example of a polar covalent compound is


493) Which is not an exception to octet rule?


494) The molecules having dipole moment are:


495) Which of the following species has a bond order other than 3?


496) Which of the following is planar?


497) The bond angle and dipole moment of water respectively, are


498) The correct order of increasing bond angles in the following species is:


499) Which compound shows hydrogen bonding?


500) Chlorine atom differs from chloride ion in the number of:


501) What is the reason for unusual high b.p. of water?


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


503) Which of the following is paramagnetic?


504) Ionization potential of Na would be numerically the same as:


505) Which one of the following conversions involve change in both hybridisation and shape?


506) According to MO theory,


507) The order of first electron affinity of O,S and Se is:


508) The correct electronegativity order is:


509) The pair of species having identical shapes for molecules of both species is


510) Amongst the following, the molecule that is linear is


511) Using MO theory predict which of the following species has the shortest bond length?


512) The hybridisation of carbon atom in benzene is?


513) Iron is tougher than sodium because:


514) A bond with maximum covalent character between non-metallic elements is formed:


515) When ionic compounds get dissolved in water:


516) Pick the odd one out (The one having zero dipole moment):


517) Which of the following shows minimum bond angle?


518) Among the following isostructural compounds, identify the compound which has the highest lattice energy


519) Which species is diamagnetic in nature?


520) Which of the following compounds would have the highest boiling point?


521) Which of the compounds has highest boiling point?


522) Which has the highest bond energy?


523) The incorrect statement among the following is:


524) The bond angle is smallest in


525) Acetic acid exists as dimer in benzene due to:


526) Chemical bond formation takes place when?


527) Which of the following has a bond order of 1.75?


528) Higher is the bond order, greater is:


529) Which has the highest ionisation potential?


530) Strongest bond is in:


531) Which of the following is not correct with respect to bond length of the species?


532) Which is likely to have the highest melting point?


533) Which of the following are not correct?


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


535) Which of the following set contains species having same angle around the central atom?


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


537) Which of the following has lowest bond angle?


538) Which of the following has shortest carbon-carbon bond length?


539) Which one of the following constitutes a group of the isoelectronic species?


540) Methanol and ethanol are miscible in water due to:


541) Which has the lowest anion to cation size ratio?


542) Which of the following has covalent bond?


543) The correct order in which the O-O bond length increases in the following is


544) As compared to covalent compounds, electrovalent compounds generally have:


545) Which is present in peroxides?


546) Which molecule is T-shaped?


547) Which of the following is paramagnetic?


548) Dipole moment is highest for:


549) Which will not conduct electricity?


550) The ionization potential order for which set is correct?


551) The bond that determines the secondary structure of a protein is:


552) Molecular orbital theory was developed mainly by


553) Which species has lone pair on central atom?


554) In which of the following molecules/ions are all the bonds not equal?


555) Super octet molecule is:


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


557) Which of the following statement is not correct?


558) Which statement is correct?


559) Which of the following pair has same structure?


560) Which of the following has dipole moment?


561) Which one of the following is highest melting halide?


562) The correct order of increasing bond angles in the following triatomic species is:


563) As the s-character of hybridization orbitals increases, the bond angle:


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


565) The correct order of decreasing polarity is


566) The process requiring the absorption of energy is:


567) Among the following metals interatomic forces are probably weakest in:


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


569) If the bond has zero per cent ionic character, the bond is:


570) The species having bond order different from that in CO is


571) The species having octahedral shape is:


572) Which of the following will show least dipole moment?


573) Which has the minimum bond energy?


574) The polarising ability of which one of the following is highest?


575) Which is expected to show paramagnetism?


576) Highest covalent character is found in which of the following?


577) The molecule which has zero moment is


578) Hydrogen bond is strongest in


579) The only molecule having dipole moment is


580) Two lone pairs of electrons and two bond pairs are present in:


581) The increase in bond order results in:


582) Which is not characteristic of π-bond?


583) Which species has the highest bond order?


584) The correct sequence of hybridisation of methane, ethene and acetylene is


585) The nature of the bond in diamond is


586) The set representing the correct order of first ionization potential is:


587) Amongst the following, the molecule that is linear is


588) Which of the following species does not exist under normal conditions?


589) Octet rule is not valid for the molecule:


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


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


592) Which set has strongest tendency to form anions?


593) In a crystal, the atoms are located at the positions of:


594) Which substance has the greatest ionic character?


595) The conductivity of the metal decreases with increases in temperature because


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


597) Which bond is more polar?


598) The pairs of bases in DNA are held together by:


599) Which of the following has highest bond angle?


600) 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?


601) The hydrogen bonding is strongest in:


602) The correct increasing order of polarising power is:


603) Acetate ion contains:


604) Which one is paramagnetic and has the bond order half (0.5)?


605) Which one is correct?


606) IP is influenced by:


607) Which of the following has lowest boiling point?


608) When metals react with non-metals, the metal atoms tend to


609) Which one has more tendency to form covalent compounds?


610) The order of melting point of ortho, para, meta-nitrophenol is


611) The hybridization of carbon in diamond, graphite and acetylene is:


612) The molecule, ion which is pyramidal in shape is


613) C-C bond order in benzene is


614) For the formation of covalent bond, the difference in the value of electronegativities should be:


615) Which among the following elements has lowest value of ionisation energy?


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


617) Paramagnetism of oxygen is explained on the basis of its electronic configuration of


618) The compound possessing most strongly ionic nature is:


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


620) Which of the following species is least stable?


621) Which group of atoms have nearly same atomic radius?


622) Bond polarity of diatomic molecule is because of


623) Which contains a coordinate and covalent bond?


624) Covalent radius of Li is 123 pm. The crystal radius of Li will be:


625) Which of the following does not contain coordinate bond?


626) With increasing bond order, stability of a bond


627) Molecular orbitals theory was proposed by:


628) The isoelectronic pair is


629) The compound 1,2-butadiene has


630) The correct order of ionic radii is:


631) The shape of sulphate ion is


632) Sodium chloride is soluble in water but not in benzene because


633) The pair likely to form the strongest hydrogen bonding:


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


635) Which is soluble in water?


636) Which of the following compounds has the lowest melting point?


637) Which of the following is false?


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


639) Among the following the maximum covalent character is shown by the compound.


640) Dipole-dipole attractive forces are strongest between the molecules of:


641) The electrons used in bonding atoms:


642) In a homonuclear molecule which of the following set of orbitals is degenerate?


643) The electronegativity order of O, F, Cl and Br is:


644) Solid NaCl is a bad conductor of electricity because:


645) 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


646) The double bonds between the two carbon atoms in ethylene consists of:


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


648) The maximum number of hydrogen bonds that a molecule of water can have is


649) Dipole moment is exhibited by:


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


651) Ionization energy of nitrogen is more than oxygen because:


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


653) Which of the following does not have a coordinate bond?


654) Which of the following sequence regarding ionisation potential of coinage metal is correct:


655) Which, molecule has zero dipole moment?


656) Hybridisation of the underline atom changes in


657) Which molecule has hydrogen bonding


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


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


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


661) Which is not true in case of ionic bond?


662) Strongest hydrogen bond is present in


663) In the cyanide ion, the formal negative charge is on:


664) The trigonal bipyramidal geometry results from the hybridisation


665) Which one of the following molecules has the smallest bond angle?


666) Which of the following is non – linear molecule?


667) Which contains both covalent and ionic bonds?


668) In the formation of NaCl by combination of Na and Cl:


669) Which of the following has linear structure?


670) The lowest ionization energy would be associated with the electronic structure:


671) Which is correct in the following?


672) Which one of the following compounds has the smallest bond angle in its molecule?


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


674) The size of ionic species is correctly given in the order:


675) Which of the following has the minimum bond length?


676) In acetylene molecule, between the carbon atoms there are


677) Bond order of 1.5 is shown by:


678) In which of the process, the bond order increases and magnetic behaviour changes?


679) Which involves a bond forming process?


680) Which is paramagnetic?


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


682) The correct order towards bond angle is


683) Which of the following is a linear molecule?


684) Which involves breaking of covalent bond?


685) 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?


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


687) Elements having six electrons in its outermost orbit generally form:


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


689) Of the following sets which one does not contain isoelectronic species?


690) Which transition involves maximum amount of energy?


691) Maximum covalence of an atom of an element is equal to:


692) Which main group elements have a different number of outermost electrons than their group number?


693) The forces present in the crystals of naphthalene are:


694) Which does not show inert pair effect?


695) The electronic theory of bonding was proposed by


696) The correct order of decreasing first ionization potential is:


697) Which of the following is more ionic?


698) The species showing pπ-dπ overlapping is:


699) Among the following which is the strongest oxidising agent?


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


701) Which of the following statements is correct?


702) The formation of energy bonds in solids are in accordance with


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


704) The predominent intermolecular forces in hydrogen fluoride is due to:


705) Correct order of bond length is


706) Which of the following molecules has pyramidal shape?


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


708) Most covalent halide of aluminium is:


709) The bond order of individual carbon-carbon bonds in benzene is:


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


711) Which pair represents isostructural species?


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


713) Which statement is not correct?


714) The pair having similar geometry is:


715) Which of the following is largest?


716) Alkali metals in each period have:


717) Valency means:


718) Which does not form two or more chlorides?


719) Which has the largest first ionisation energy?


720) Polarization of electrons in acrolein may be written as:


721) Which bond has the highest bond energy?


722) 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?


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


724) Which contains both polar and non-polar covalent bonds?


725) How many – bonds are present in naphthalene?


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


727) Which of the following species in non-linear?


728) The bond order of CO molecule on the basis of molecular orbital theory is:


729) Which one is the strongest bond?


730) Which of the following compound has maximum volatility?


731) Hybridisation shown by carbon and oxygen of –OH group in phenol are respectively


732) The molecule which has pyramidal shape is:


733) The correct increasing bond angles order is:


734) Van der Waals’ forces are applied to:


735) Which shows the least dipole moment?


736) Which force is strongest?


737) Which molecule has linear structure?


738) Which ion has a higher polarizing power?


739) The solubility of KCl is relatively more in (where D is dielectric constant):


740) Elements have electronegativities 1.2 and 3.0, bond formed between them would be


741) Among the following, the pair in which the two species are not isostructural, is


742) Which has zero dipole moment?


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


744) Which one of the following is a correct set?


745) Which property of halogens increases from F to I?


746) The total number of bonds in acetylene molecule is:


747) Variable valency is characteristic of:


748) In which molecule all atoms are coplanar?


749) Bond energy of covalent O—H bond in water is:


750) Which one of the following has a coordinate bond?


751) Which carbon is more electronegative?


752) Paramagnetism is exhibited by molecules:


753) Which molecule has the largest dipole moment?


754) The intermolecular attractive forces vary in the order:


755) Which of the following species has a linear shape?


756) Which of the following will provide the most efficient overlap?


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


758) Which one species has the longest bond length?


759) The pair of molecules forming strongest hydrogen bonds are


760) Which one of the following has not triangular pyramidal shape?


761) A covalent bond is formed between the atoms by the overlapping of orbitals containing:


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


763) Which is distilled first?


764) Which one of the following is a correct set?


765) Which is correct order for electron gain enthalpy?


766) Which is a pyramidal structure?


767) Among the following mixtures, dipole – dipole as the major interaction, is present in


768) In dry ice there are … in between molecules.


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


770) Which formulae does not correctly represents the bonding capacity of the atom involved?


771) Which has minimum ionic radius?


772) The bond order is maximum in


773) Resonance is due to:


774) Which property is commonly exhibited by a covalent compound?


775) Which of the following is an electrovalent linkage?


776) Which metal has a greater tendency to form metal oxide?


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


778) How many electron pairs are present in valence shell of oxygen in water molecule?


779) Number of electrons in a the valence orbit of nitrogen in an ammonia molecule is


780) The number of valency electrons in carbon atom is:


781) Which one among the following does not have the hydrogen bond?


782) Which of the following molecules/ions does not contain unpaired electrons.


783) The C-O-H bond angle in ethanol is nearly


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


785) Which has a giant covalent structure?


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


787) Which one of the following elements has lower value of ionisation energy?


788) The lattice energy order for lithium halide is:


789) 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?


790) Which is the weakest among the following type of bond?


791) Bond length decreases with:


792) Which of the following molecules/ ions does not contain unpaired electrons?


793) In which of the following bond angle is maximum?


794) The hybridisation of the ipso – carbon dichlorobenzene is


795) Which of the following has maximum dipole moment?


796) The molecule having largest dipole moment among the following is


797) Which of the following diatomic molecules would be stabilized by the removal of an electron?


798) Which of the following possess maximum hydration energy?


799) In which of the following hydrogen bond is present?


800) The correct order of decreasing polarisability of ion is:


801) Which is highest melting point halide?


802) Number of σ and π bonds in acetylene are


803) Which of the following halides is least stable and has doubtful existence?


804) C-C bond length is maximum in


805) Resonance is not shown by:


806) In which of the following compounds, the bonds have the largest percentage of ionic character:


807) The linear structure is possessed by:


808) Which species has the maximum number of lone pair of electrons on the central atom?


809) Which concept best explains that o-nitrophenol is more volatile than p-nitrophenol?


810) The comparatively high b.p. of HF is due to


811) Which one of the following species is diamagnetic in nature?


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


813) In which of the following process energy is liberated?


814) Identify the least stable ion amongst the following:


815) The lowest bond energy exist in the following bonds for:


816) Which one is electron deficient compound?


817) Pauling’s electronegativity values for elements are useful in predicting:


818) 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?


819) Which has triangular planar shape?


820) Which of the following molecule has highest bond energy?


821) Which one of the following pairs of species have the same bond order?


822) Which hybridization results non-polar orbitals?


823) The element with strong electropositive nature is:


824) Which statement is correct?


825) Which one of the following sets of ions represents a collection of isoelectronic species?


826) Which molecule has zero dipole-moment?


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


828) Which one of the following compounds has bond angle as nearly 90°?


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


830) Which is the most covalent?


831) Which of the ions has the largest ionic radius?


832) Which of the following is not isoelectronic?


833) In which set of molecules are all the species paramagnetic?


834) Which of the following has strongest hydrogen bonding?


835) The angle between two covalent bonds is maximum in:


836) The pair having similar geometry is


837) In the electronic structure of acetic acid there are:


838) Increasing order (lower first) of size of the various hybridised orbitals is:


839) Among the following, the compound that contains ionic, covalent and coordinate linkage is


840) The bond length is maximum in:


841) Which of the following has maximum number of lone pairs associated with Xe?


842) Which is most volatile compound?


843) In which of the following pairs bond angle is 109 ͦ28′ ?


844) Which of the following molecules has three-fold axis of symmetry?


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


846) Which one of the following is paramagnetic?


847) Which of the following has largest ionic radius?


848) Lattice energy of a solid increases if


849) Which one is most polar?


850) The high boiling point of water is due to:


851) In which pair of species, both species do have the similar geometry?


852) Which of the following is largest ion?


853) The electronic configuration of sodium and chlorine justifies:


854) Glycerol is more viscous than ethanol due to


855) In the case of alkali metals, the covalent character decreases in the order:


856) Two nodal planes are present in


857) H – bond is not present in


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


859) Which of the following halides has maximum melting point?


860) Which atomic orbital is always involved in sigma bonding only?


861) Which of the following acts sometimes as a metal and sometimes as a non-metal?


862) Amongst the following elements the configuration having the highest ionization energy is:


863) Which of the following species exhibits the diamagnetic behaviour ?


864) Which is a good solvent for ionic and polar covalent compounds?


865) The following salt shows maximum covalent character


866) Each of the followings has non-zero dipole moment, except:


867) Resonance structures can be written for


868) Born-Haber cycle may be used to calculate


869) In which element shielding effect is not possible?


870) Which of the following is isoelectronic with carbon atom?


871) Which of the following statement is correct?


872) The value of bond order in nitrogen and oxygen molecule is:


873) Pauling received Nobel Prize for his work on:


874) The enhanced force of cohesion in metals is due to:


875) Among HX, the maximum dipole moment is of:


876) Dative bond is present in:


877) Which has an odd electron and shows paramagnetic character?


878) Which species is paramagnetic?


879) Structure of ammonia is


880) The example of the p-p-orbital overlapping is the formation of:


881) In which of the following pπ - dπ bonding is observed?


882) Which has the lowest bond angle?


883) The energy of antibonding molecular orbitals is:


884) The set representing the correct order of ionic radius is:


885) Which of the following hydrogen bonds is the strongest?


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


887) Phosphoric acid is syrupy in nature due to


888) The correct order of bond angles is:


889) Metallic lusture is explained by


890) Which of the following phenomenon will occur when two atoms of same spin will react?


891) Among the following the pair in which the two species are not isostructural is


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


893) Intramolecular hydrogen bonding is found in:


894) 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:


895) Which of the following has minimum melting point?


896) Geometry of ammonia molecule and the hybridisation of nitrogen involved in it are


897) The molecule having smallest bond angle is


898) For a covalent solid, the units which occupy lattice points are:


899) The ionization energy will be maximum for the process:


900) Born Haber cycle is used to determine:


901) Which of the following element has higher ionisation energy?


902) In a double bond connecting two atoms there is a sharing of:


903) Elements whose electronegativities are 1.2 and 3.0 form:


904) Which of the following is correct?


905) Which of the following is a favourable factor for cation formation?


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


907) When a metal atom combines with a non-metal atom, the non-metal atom will


908) The hydration of ionic compounds involves:


909) Which of the following is diamagnetic?


910) According to Fajan’s rule polarization is more when:


911) Organic compounds soluble in water contain:


912) Atomic radii of fluorine and neon in angstrom unit are respectively given by:


913) The decreasing order of bond angle is


914) The correct order of dipole moment is:


915) Which of the following molecules does not possess a permanent electric dipole moment?


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


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


918) Debye an unit of dipole moment is of the order of:


919) Which of the following is a favourable factor for cation formation?


920) The paramagnetic molecule at ground state among the following is


921) The bond in the formation of fluorine molecule will be


922) The diamagnetic molecules are:


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


924) The fHOMO in CO is


925) Coordinate compounds are formed by:


926) Which shows non-directional bonding?


927) Which one of the following contains both ionic and covalent bonds?


928) Which of the following does not apply to metallic bond?


929) Van der Waals’ forces are maximum in:


930) The molecule having zero dipole moment is


931) For a stable molecule, the value of bond order must be


932) Which compound among the following has more covalent character?


933) Which among the following has the largest dipole moment?


934) A square planar complex is formed by hybridisation of the following atomic orbitals


935) Which of the following pairs are isostructural?


936) Hydration of different ions in aqueous solution is an example of


937) Atoms or group of atoms which are electrically charged are known as:


938) Which among the following elements has lowest value of ionisation energy?


939) Which one pair of atoms or ions will have same configuration?


940) Which combination is best explained by the coordinate covalent bond?


941) Which shows the highest lattice energy?


942) The correct order regarding the electronegativity of hybrid orbitals of carbon is:


943) Which of the following compounds does not follow the octet rule for electron distribution?


944) Which of the following sets represents the collection of isoelectronic species?


945) Which of the following has unchanged valency?


946) Which molecule has trigonal planar geometry?


947) Malleability and ductility of metals can be accounted due to


948) Hydrogen fluoride is a liquid unlike other hydrogen halides because:


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


950) In which one of the following cases, breaking of covalent bond takes place?


951) Which compound is soluble in water


952) Which statement is true?


953) Which compound does not contain double bond or triple bond?


954) The compound showing maximum covalent character is:


955) Which statement is wrong?


956) Among the following, the paramagnetic compound is


957) HCl molecule in the vapour state is an example of:


958) The electrons in an incomplete outershell are known as:


959) The element which exists in both hard and soft form is:


960) Which of the following is not a correct statement?


961) The bond strength increases:


962) Which has higher bond energy and stronger bond?


963) Which of the following statements regarding carbon monoxide is correct?


964) Which of the following is having highest bond length?


965) Which does not have pyramidal geometry?


966) Which of the following oxides is not expected to react with sodium hydroxide?


967) How many medal india win in Singapore Weightlifting International ?


968) How many gold medal india win in Singapore Weightlifting International ?


969) National Science Day is celebrated on


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