Practice Test


1) Which of the following statement is most appropriate about effective nuclear charge? It depends upon


2) Which of the following pairs are chemically dissimilar?


3) The element with atomic number 33 belongs to


4) In the long form of the periodic table, the transition metals are placed in


5) The valency of noble gas, in general, is


6) Which of the following pair of atomic number represent s-block element?


7) Which of the following gaseous ions contains maximum number of unpaired electrons ?


8) The maximum tendency to form the gaseous unipositive ion is for the element with the configuration


9) Which of the following elements has higher electron affinity?


10) Which of the Following ions is smallest in size?


11) Pauling's electronegativity values for elements are useful in predicting


12) Among O, C, F, Cl, Br the correct order of increasing radii is


13) Alkali metals in each period have


14) The correct order of electron affinity of B,C,N,O is


15) Which of the following has highest first ionisation potential ?


16) Which one of the following arrangements does not represent the property indicated against it?


17) Which of the following has least electron affinity?


18) Ionisation energy is highest in


19) The decreasing order of the ionisation potential of the following element is


20) Which of the following order is correct for the first ionisation potential od B,C and N?


21) An atom with high electronegativity has


22) Ionic radii are


23) The order of first ionisation energies of the element Li,Be,B, Na is


24) The element with atomic number 55 belong to which block of the periodic table


25) The correct order of electron affinity among the following is


26) Which of the following set of atomic number belongs to that of alkali metals?


27) Number of elements present in 5th period is


28) Which of the following order of ionization energy is correct


29) Which one of the following is incorrect statement?


30) Which is true about the electronegativity order of the following?


31) Four successive member of the first row transition elements are listed below with their atomic numbers. which one of them is expected to hav the highest third ionisation energy?


32) Identify the correct order in which the covalent radius of the following element increase
(I)Ti (II)Ca (III)Sc


33) Variable valency is generally exhibited by


34) Which period of the table contains maximum number of elements


35) The lighter metal is


36) The ionisation energy of an atom is the energy


37) Amongst the following elements which one has the greatest tendency to lose electron.


38) Which of the following element has greatest tendency to lose electron?


39) Which among the following element has lowest value of ionisation potential?


40) In the second period of periodic table,the ionisation potential of element increase from left to right because of


41) The attraction that an atom exerts on a pair of electrons that are being shared with another atom for forming covalent bond is referred to as its


42) Which of the following element has the maximum electron affinity ?


43) Which of the following configuration represent atoms of elements having the highest second ionisation energy?


44) Which among the following species has the highest ionisation energy ?


45) Which of the following order is wrong?


46) For electron affinity of halogens which of the following is correct ?


47) Which one of the following arrangements represent the correct order of electron gain enthalpy (with negative sign) of the given atomic species ?


48) In the periodic table, the element with atomic number 16 will be placed in group


49) In the modern long form of the periodic table, elements are arranged in the increasing order of


50) In any period of the periodic table, valency of an element


51) Eka-aluminium and Eka-silicon are known as


52) Which of the following is most electronegative ?


53) Electron affinity depends on


54) In a given shell, the order of screening effect is


55) The electronic configuration of four elements are given below. Which element does not belong to the same family?


56) The first element of rare earth metal is


57) The valence shell of transition elements consist of


58) Element with atomic number 56 belong to which block ?


59) The screening effect of d-electron is


60) In the periodic table, with the increase in the atomic number the metallic character of the element


61) Which of the following decrease in going down the halogen group?


62) Among the following elements which one has the high value of first ioisation potential?


63) The correct arrangement of increasing order of atomic radii among Na, K, Mg, Rb is


64) Which of the following species has the highest ionisation potential ?


65) The total number of inner transition elements is


66) The properties of the elements are the periodic function of their atomic number. The statement is given by


67) Which of the following pair belongs to same period of the periodic table?


68) The elements with atomic number 26 will be found in group


69) Which of the following pairs of atomic number represent elements belonging to the same group ?


70) The electronic configuration of Gadolinium (Atomic number 64) is


71) Which of the following represent elements in order of increasing atomic size ?


72) Which of the following ions has the largest ions radius?


73) Of the given alkali metals, the one with smallest size is


74) The Melting point is lowest for


75) Among the elements given below, the one with highest electropositivity is


76) Which of the following elements is most electronegative?


77) The electronegativity of the following elements increase in the order


78) Which of the following oxide are neutral ?


79) Which of the following arrangement show the correct order of decreasing paramagnetism?


80) Which of the following is arranged in order of increasing density ?


81) Which of the following is arranged in order of increasing density ?


82) The basic strength of the hydroxide of the following alkaline earth metals follow the order


83) Among the following elements, the second ionization energy is maximum for


84) Among the following metals, the most dense is


85) Which of the following is arranged in order of decreasing melting point ?


86) Which of the following properties does not depend on periodicity?


87) Among the following which has maximum density ?


88) Which of the following is arranged in order of increasing second ionization energy?


89) Which of the following is statement is correct?


90) With which of the following configuration the lowest value of first IE is associated?


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


92) Which of the following metal requires radiation of highest frequency to cause emission of electron ?


93) Which of the following does not reflect the periodicity of elements ?


94) The number of element in the 4th period of periodic table is


95) The oxide of which of the following elements will be acidic in character ?


96) Which of the following isoelectronic ions has the lowest ionisation energy?


97) The atomic radius increase as we move down a group because


98) How does the ionisation energy of 1st group element vary ?


99) What is general outer electronic configuration of the coinage metals?


100) Which of the following is isoeletronic with carbon atom?


101) Which of the following electronic configuration is of transition elements ?


102) The atomic radius of elements of which of these would be nearly same ?


103) Gradual addition of electronic shell in the noble gases causes a decrease in their


104) Which of the following statement is correct ?


105) Which of the following has the smallest size ?


106) The correct order of increasing ionic character ?


107) Which one of the following is correct order of the size ?


108) The ionisation potential is lower for the


109) An element of atomic number 29 belong to which of the following block of the periodic table ?


110) The element with highest electron affinity among the halogens is


111) Which of the following is not isoelectronic ?


112) Two elements whose electronegativities are 1.2 and 3.0, the bond formed between them would be


113) With reference to ionisation potential which one of the following sets is correct ?


114) The element with atomic number 9, 17, 35, 53, 85 are all


115) Which one of the following groupings represent a collection of isoelectronic species ?
(Atomic number : Cs =55 , Br = 35)


116) According to the Periodic Law of elements, the variation in properties of elements is related to their


117) Which of the following ion has the highest value of ionic radius?


118) In which of the following arrangements, the order is not according to the property indicated against it?


119) Which of the following oxides is amphoteric in character ?


120) Atomic radius of fluorine and neon (in Angstrom units) respectively are given as


121) The electronegativity of the following elements increase the order


122) Which of the following values in electron volt per atom represent the first ionisation energies of oxygen and nitrogen atom respectively?


123) Which of the following is the smallest in size?


124) The first ionisation potential of Na, Mg, Al and Si are in order


125) Among the following element (whose electronic configurations are given below) the one having the highest ionisation energy is


126) Which one of the following is correct order of increasing of size ?


127) The correct order of electron affinity of the element of oxygen family in a periodic table is


128) The statement that is not correct for the periodic classification of elements is


129) Which one of the following has largest size ?


130) The decreasing order of the second ionisation energy of K, Ca and Ba is
(Atomic number K = 19, Ca = 20, Ba = 56 )


131) The incorrect statement among the following is


132) Ionic radii of


133) The Correct order of radii is


134) The set representing the correct order of first ionisation potential is


135) Identify the least stable ion among the following


136) Which block 106th element belong to?


137) Which of the following pairs show reverse properties on moving along a period from left to right and from top to down in group?


138) Which among the following species have the same number of electrons in its outermost as well as penultimate shell?


139) The size of the following species increase in the order


140) Which of the following species has the highest electron affinity ?


141) Which electronic configuration of an element has abnormally high difference second and third ionisation energy ?


142) The incorrect statement among the following is


143) Lattice energy of an ionic compound depends upon


144) Which one of the following sets of ions represent collection of isoelectronic species ?


145) The increase order of the first ionisation enthalpies of the elements B, P, S ans F (Lower first) is


146) Following statement regarding the periodic trends of chemical reactivity of alkali metals and the halogens are given. Which of these statement gives the correct picture ?


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


148) The set representing the correct order of ionic radius id


149) Born Haber cycle is used to determine:


150) The element with strong electropositive nature is:


151) Octet rule is not valid for the molecule:


152) The correct order of reactivity of halogens is


153) The screening effect of d-electrons is:


154) Which has the largest first ionisation energy?


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


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


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


158) Which element of second period forms most acidic oxide?


159) Which is correct in the following?


160) The linear structure is possessed by:


161) Which of the following has largest ionic radius?


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


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


164) Which statement is wrong?


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


166) The second electron affinity is zero for


167) For alkali metals, which one of the following trends is incorrect?


168) If Aufbau rule is not followed, K-19 will be placed in


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


170) Which has the minimum bond energy?


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


172) The tenth elements in the Periodic Table resembles with the


173) Which is not the correct order for the stated property?


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


175) Which of the following oxides is most acidic in nature?


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


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


178) If the bond has zero percent ionic character, the bond is:


179) Mendeleef's Periodic Table is upset by the fact that


180) The incorrect statement among the following is:


181) Which one of the following is an amphoteric oxide?


182) Which one is correct?


183) In which one of the following pairs the radius of the second species is greater than that of the first?


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


185) According to IUPAC nomenclature, a newly discovered element has been named as Uun. The atomic number of the element is


186) The correct order of increasing electron affinity of halogens is


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


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


189) The bond length is maximum in:


190) Which of the following is the most electropositive element?


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


192) Which of the following statements is wrong?


193) Which one of the following has the lowest ionisation energy?


194) The set representing the correct order of first ionisation potential is:


195) Which one of the following belongs to representative group of elements in the Periodic Table?


196) 1, 3-butadiene has:


197) Which of the following transitions involves maximum amount of energy?


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


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


200) Which of the following has largest ionic radius?


201) Which will not conduct electricity?


202) The bond order is maximum in:


203) The screening effect of d-electros is


204) Which is not linear?


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


206) The molecule which has pyramidal shape is:


207) The complex ion which has no 'd' electrons in the central metal atom is:


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


209) Strongest bond is in:


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


211) Diagonal relationship is for


212) Bond order of 1.5 is shown by:


213) Which one of the following is an amphoteric oxide?


214) Point out the wrong statement. On moving horizontally from left to right across a period in the Periodic Table


215) The correct increasing bond angles order is:


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


217) Which hybridization results non-polar orbitals?


218) Intramolecular hydrogen bonding is found in:


219) Amphoteric oxide combinations are in


220) Chlorine atom tends to acquire the structure of:


221) Which of the following ion is the smallest ion?


222) Variable valency is characteristic of:


223) Which force is strongest?


224) Identify the transition element.


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


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


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


228) Resonance is not shown by:


229) Dipole moment is highest for:


230) In which of the following crystals of ionic compounds would you expect maximum distance between the centres of cotions and anions


231) Which of the following has lowest bond angle?


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


233) Alkali metals in each period have:


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


235) Which of the following is least ionic?


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


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


238) The pair having similar geometry is :


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


240) The correct order of increasing oxidising power is


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


242) Which element has the lowest electronegativity?


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


244) Which species does not exist?


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


246) Which is distilled first?


247) The equilateral triangle shape has:


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


249) Two ice cubes are pressed over each other and unite to form one cube. Which force is responsible for holding them together?


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


251) Which is not an exception to octet rule?


252) Higher is the bond order, greater is:


253) Highest electron affinity among the following is


254) Which of the following has fractional bond order?


255) The electrons used in bonding atoms:


256) The discovery of which of the following group of elements gave death blow to the Newland's law of octaves?


257) Generally, the first ionisation energy increases along a period. But there are some exceptions. One which is not an exception is


258) Which one of the following orders presents the correct sequence of the increasing basic nature of the given oxides?


259) The basis of keeping the elements in the groups of The Periodic Table is


260) The first four ionisation energy values of an element are 191, 578, 872 and 5962 kcal. The number of valence electrons in the element is


261) Correct increasing order of first ionisation potential is


262) Which pair represents isostructural species?


263) The first ionisation potential (eV) of Be and B respectively are


264) The correct order according to size is


265) The correct order of electron affinity is


266) Which of the following is a false statement?


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


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


269) The correct order of ionisation energy for comparing carbon, nitrogen and oxygen is


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


271) Most covalent halide of aluminium is:


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


273) Which of the following pairs has both members from the same group of the Periodic Table?


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


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


276) Which of the following are not correct?


277) The order of first ionisation energies of the element Li, Be, B, Na is


278) Differentiating electron in inner transition elements enters the………….. orbital.


279) Which is expected to conduct electricity?


280) Elements whose electronegativities are 1.2 and 3.0, form:


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


282) In the Periodic Table, going down in the fluorine group


283) The ionisation energy of nitrogen is larger than that of oxygen because of


284) Which has the highest ionisation potential?


285) Which of the following does not represents the correct order of the property indicated?


286) The electronic configuration of most electronegative elements is


287) Which group of the Periodic Table does not contain only metals?


288) Which of the following is a metalloid?


289) Which of the following have highest electron affinity?


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


291) As one moves along a given row in the Periodic Table, ionisation energy


292) The lightest metal is


293) Which is the property of non-metal?


294) In a given shell the order of screening effect is


295) Which of the following statements is correct?


296) Number of elements presents in the fifth period of periodic table is


297) The compound possessing most strongly ionic nature is:


298) What is the name of element with atomic number 105?


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


300) The outermost electronic configuration of the most electronegative element is


301) The incorrect statements regarding bonding molecular orbitals because:


302) Which of the following has largest size?


303) Which one of the elements has the maximum electron affinity?


304) Which one of the following process requiring absorption of energy?


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


306) Which ionisation potential (IP) in the following equations involves the greatest amount of energy?


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


308) Who developed the long form of Periodic Table?


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


310) Which of the following pairs show reverse properties on moving along a period from left to right and from top to down in a group?


311) Which of the following relation is correct?


312) Which has higher bond energy and stronger bond?


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


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


315) Which transition involves maximum amount of energy?


316) The order of stability of metal oxides is


317) The first ionisation potential of Na, Mg, Al and Si are in the order


318) Which of the following two are isostructural?


319) Which of the following metal oxides is most basic?


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


321) The maximum valency of an element with atomic number 7 is


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


323) Nitrogen dioxide cannot be prepared by heating


324) Which of the following is correct order of increasing size?


325) The correct order of bond angles is:


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


327) The element with atomic number 117 if discovered would be placed in


328) The element with atomic numbers 9, 17, 35, 53, 85 are all


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


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


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


332) Which has zero dipole moment?


333) Which group of the Periodic Table contains coinage metal?


334) Ionisation potential values of 'd' block elements as compared to ionisation potential values of 'f' block elements are:


335) An element with atomic number 20 will be placed in which period of the Periodic Table?


336) The correct order of ionisation energy for comparing carbon, nitrogen and oxygen atom is


337) In which of the following arrangements the order is not according to the property indicated against it?


338) Pauling received Nobel Prize for his work on:


339) For electron affinity of halogens, which of the following is correct?


340) The correct electronegativity order is:


341) Which of the following properties show gradual decrease with increase in atomic number across a period in the Periodic Table?


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


343) The lattice energy order for lithium halide is:


344) The correct increasing order off polarising power is:


345) Increase in atomic size down the group is due to


346) When the first ionisation energies are plotted against atomic number, the peaks are occupied by


347) Which of the following is non-metallic?


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


349) Which is soluble in water?


350) Highest energy will be absorbed to eject out the electron in the configuration


351) Most acidic oxide is


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


353) H-bonding is not present in:


354) Which formulae does not correctly represent the bonding capacity of the atom involved?


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


356) Which one of the following combinations represents a metallic element?


357) Which bond has the highest bond energy?


358) The increasing order of first ionisation enthalpies of the elements B, P, S and F (lowest first) is


359) Which of the following pairs are isostructural?


360) The electronic configuration of transition elements is exhibited by


361) The first ionisation energy of oxygen is less than that of nitrogen. Which of the following is the correct reason for this observation?


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


363) Valency means:


364) Which of the following has highest bond angle?


365) The halogen that most easily reduced is


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


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


368) Electron deficient species are known as:


369) Metallic bonds do not play a role in:


370) Pauling's electronegativity values for elements are useful in predicting:


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


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


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


374) Dipole moment is exhibited by:


375) In the Periodic Table metals usually used as catalyst belong to


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


377) The increase in bond order results in:


378) In which molecule all atoms are coplanar?


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


380) Which represents a collection of isoelectronic species?


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


382) Which has the highest bond energy?


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


384) Be resembles much with


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


386) Which molecule is planar?


387) Which is present in peroxides?


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


389) Which does not form two or more chlorides?


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


391) Which one of the following statement is false?


392) Which of the following halides is most acidic?


393) Identify the correct order in which the covalent radius of the following elements increases
(I) Ti
(II) Ca
(III) Sc


394) Which is chemically most active non-metal?


395) Electron affinity is the


396) Which is paramagnetic?


397) The bond length of LiF will be


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


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


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


401) An element with atomic number 21 is a


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


403) Which one of the following oxides is amphoteric in character?


404) The correct order in which the first ionisation potential increases is


405) The correct order of electron gain enthalpy with negative sign of F, Cl, Br and I, having atomic number 9, 17, 35 and 53 respectively, is


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


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


408) If the IP of Na is 5.48 eV, the ionisation potential of K will be


409) The electronic configuration of the atom having maximum difference in first and second ionisation energies is


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


411) The property of attracting electrons by the halogen atoms in a molecule is called


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


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


414) A molecule which cannot exist theoretically is:


415) A sudden large jump between the values of second and third ionisation energies of an element would be associated with the electronic configuration


416) The correct order of radii is:


417) The ionic radius of 'Cr' is minimum in which of the following compounds?


418) Which molecule has trigonal planar geometry?


419) Which is the general outer electronic configuration of the coinage metals?


420) The values of electronegativity of atom A and B are 1.20 and 4.0 respectively. The percentage of ionic character of A- B bond is


421) Which of the following element is most electropositive?


422) Super octet molecule is:


423) Which of the following elements will have the lowest first ionisation energy?


424) The diamagnetic molecules are:


425) Which of the following electronic configuration represents noble gas?


426) The number of naturally occurring p- block elements that are diamagnetic is


427) Which of the following element shows maximum valency?


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


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


430) Which element has the highest electronegativity?


431) Metallic nature and basic nature of the oxides…… as we move along a period


432) In which block does 106th element belong?


433) Which of the following is more ionic?


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


435) Which one is electron deficient compound?


436) Which of the following is largest ion?


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


438) Ionisation energy in group 1-A varies in the decreasing order as


439) Paramagnetism is exhibited by molecules:


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


441) In third row of Periodic Table, the atomic radii from Na to Cl


442) Which has a giant covalent structure?


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


444) When an electron is removed from an atom, its energy


445) As a result of resonance:


446) Polar covalent compounds are soluble in:


447) The elements with atomic numbers 9, 17, 35, 53, 85 are all


448) Which among the following has highest ionic radius?


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


450) The element having highest electron affinity is


451) Fluorine has low electron affinity than chlorine because of


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


453) Which species has lone pair on central atom?


454) Which contains both covalent and ionic bonds?


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


456) Which of the following has unchanged valency?


457) The general electronic configuration of the transition elements is


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


459) Which of the following oxides doesn't react with both of an acid and alkali, is?


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


461) Which of the following sequence correctly represents the decreasing acidic nature of oxides?


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


463) Which ion has a higher polarizing power?


464) The first ionisation potential is maximum for


465) The highest first ionisation potential is of


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


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


468) Variable valency in general, is exhibited by


469) Which statement is true?


470) The bond strength increases:


471) Which species is paramagnetic?


472) Chemical bond formation takes place when:


473) Which has the smallest size?


474) Observe the following statement
I. The physical and chemical properties of elements are periodic functions of their electronic
configuration.
II. Electronegativity of fluorine is less than the electronegativity of chlorine.
III. Electropositive nature decreases from top to bottom in a group.
The correct answer is


475) The only non-metal which is liquid at ordinary temperature is


476) Which has triangular planar shape?


477) With respect to chlorine, hydrogen will be


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


479) Which element has maximum electron affinity?


480) Ionisation potential is lowest for


481) 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?


482) The outermost configuration of the least reactive element is


483) Elements of the same vertical group of the Periodic Table have


484) Ionisation potential for a noble gas is


485) Which of the following possess maximum hydration energy?


486) Following statements regarding the periodic trends of chemical reactivity to the alkali metals and the halogens are given. Which of these statements gives the correct picture?


487) Which has minimum ionic radius?


488) The ionisation potential order for which set is correct?


489) The correct sequence which shows decreasing order of the ionic radii of the elements is


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


491) 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:


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


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


494) Van der Waals' forces are applied to:


495) The correct order of dipole moment is:


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


497) Which statement is correct?


498) Which is highest melting point halide?


499) Elements of which group form anions most readily?


500) Which is not a scale of measuring electronegativity?


501) In the series ethane, ethylene and acetylene, the C - H bond energy is :


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


503) In the Periodic Table metallic character of elements shows one of the following trend


504) When sodium and chlorine react, energy is:


505) In third row of Periodic Table from Na to Cl


506) The molecule having smallest bond angle is:


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


508) The hydration of ionic compounds involves:


509) Which of the following is the atomic number of a metal?


510) Which statement is correct?


511) The correct order of size of iodine species is


512) Which of the following statement is wrong?


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


514) Among the following, the number of elements showing only one non-zero oxidation state is O, Cl, F, N, P, Sn, Tl, Na, Ti


515) The correct decreasing order of first ionisation enthalpies of five elements of the second period is


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


517) Of the following elements, which one has the highest electronegativity?


518) The hydrogen bonding is strongest in:


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


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


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


522) Which one of the following has the highest electronegativity?


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


524) The energy of antibonding molecular orbitals is:


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


526) How does the ionisation energy of 1st group elements vary?


527) Which one of the following pairs is isostructural (i.e., having the same shape and hybridization)?


528) Which shows the highest lattice energy?


529) Which does not have pyramidal geometry?


530) Dative bond is present in:


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


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


533) Which has highest melting point?


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


535) The least stable ion among the following is


536) The electron affinity values for the halogens show the following trend


537) The elements present in the core of earth are collectively known as


538) In the Modern Periodic Table, elements are arranged


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


540) Which compound shows hydrogen bonding?


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


542) Which shows non-directional bonding?


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


544) Bond energy of covalent O - H bond in water is :


545) Which is expected to show paramagnetism?


546) Which pair has both members from the same period of Periodic Table?


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


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


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


550) The intermolecular attractive forces vary in the order:


551) Which have zero dipole moment?


552) When ionic compounds get dissolved in water:


553) Which one of the following elements has the highest ionisation energy?


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


555) Which of the following pairs show reverse properties on moving along a period from left to right and from top to down in a group?


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


557) Bond length decreases with:


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


559) Which of the following oxides is most basic?


560) Which one of the following ions has the highest value of ionic radius?


561) Which has the lowest bond angle?


562) Pauling's electronegativity values for elements are useful in predicting


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


564) Strongest oxidising agent among halogen is


565) Which contains a coordinate and covalent bond?


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


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


568) IP is influenced by:


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


570) Which of the following is correct?


571) Molecular orbitals theory was proposed by:


572) Proton plays an important role in … bonding .


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


574) Which of the following statement is correct?


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


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


577) Iron is tougher than sodium because:


578) In HCHO carbon atom has hybridisation:


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


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


581) The correct order of ionic radii is:


582) Greater the dipole moment:


583) First ionisation energy is highest for


584) According to the Periodic Law of elements, the variation in properties of elements is related to their


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


586) The ionisation energy will be maximum for the process:


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


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


589) The carbon atom in graphite is:


590) Which involves a bond forming process?


591) Which element has highest electronegativity?


592) The trivalent ion having largest size in lanthanide series is


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


594) Which of the following is an amphoteric oxide?


595) In which element shielding effect is not possible?


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


597) Which one is the weakest bond?


598) Which has the lowest anion to cation size ration?


599) Which set has strongest tendency to form anions?


600) Which one is most polar?


601) Acetate ion contains:


602) Which of the following isoelectronic ions has lowest ionisation energy?


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


604) Van der Waals' forces between molecules depend upon:


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


606) Which does not show hydrogen bonding?


607) A trend common to both group I and VII elements in the Periodic Table as atomic number increases is


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


609) Which of the atomic number pairs represents elements of s-block?


610) The correct order of decreasing first ionisation energy is


611) The total number of bonds in acetylene molecules is:


612) The elements X, Y, Z and T have the indicated electronic configuration. Starting with the innermost shell, which is the most metallic element?


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


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


615) Which of the following is largest?


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


617) Which of the following statements is wrong?


618) 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?


619) Which is correct order for electron gain enthalpy?


620) The first ionisation energy of lithium will be


621) When two atomic orbitals combine, they form:


622) The set representing the correct order of first ionisation energy is


623) The electronic configuration of the element with maximum electron affinity is


624) Which of the following has regular tetrahedral shape?


625) The smallest among the following ions is


626) Coordinate compounds are formed by:


627) The statement that is true for the long form of the Periodic Table is


628) Which of the following elements never show positive oxidation number?


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


630) Which one of the following is expected to have largest size?


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


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


633) Identify the least stable ion amongst the following:


634) 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?


635) According to Fajan's rule polarization is more when:


636) Which is correct about ionisation potential?


637) A sudden large jump between the value of first and second ionisation energies of elements would be associated with which of the following electronic configurations?


638) The pair of amphoteric hydroxides is


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


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


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


642) Shape of molecules is decided by:


643) Which statement is wrong?


644) Which one of the following has maximum ionisation potential?


645) Which is the correct order of electronegativity?


646) Which of the following has maximum bond energy?


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


648) The O - H bond distance in water molecule is:


649) Van der Waals' forces are maximum in:


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


651) Which of the following exhibits diamagnetic behavior?


652) The electronic configuration of sodium and chlorine justifies:


653) The correct order of radii is


654) The compound showing maximum covalent character is:


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


656) The pair of species having identical shape of both species:


657) Which of the following halogen acids is least basic?


658) Beryllium shows diagonal relationship with


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


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


661) Correct order of first ionisation potential among the following elements Be, B, C, N, O is


662) For making good quality mirrors, plates of float glass are used. These are obtained by floating molten glass over a liquid metal which does not solidify before glass. The metal used can be


663) Which of the following pairs has both members of the same period of the Periodic Table?


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


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


666) The correct order of acidic strength


667) Which of the following element is metalloid?


668) Which of the following metals exhibits more than one oxidation state?


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


670) The correct order of ionic radius is


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


672) The element with the lowest ionisation potential is


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


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


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


676) The element with atomic number 36 belongs to …block in the Periodic Table.


677) Which bond is more polar?


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


679) In the following, the element with the highest ionisation energy is


680) Ionization potential is lowest for:


681) Electron affinity is positive, when


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


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


684) Water has high heat of vaporization due to:


685) Stability of hydrides generally increases with:


686) Which one is the strongest bond?


687) The metal having highest melting point is?


688) Which one species has the longest bond length?


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


690) The pair of elements having approximately equal ionisation potential is


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


692) Which of the following is false?


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


694) As we go from left to right in period two of the Periodic Table, gram atomic volume of the elements


695) Which of the following bond requires the largest amount of energy to dissociate the bond concerned?


696) Which does not show inert pair effect?


697) Resonance is due to:


698) The ICl molecule is:


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


700) Which of the following electronic configurations in the outermost shell is characteristic of alkali metals?


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


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


703) The Ist IEs of four consecutive elements present in the second period of Periodic Table are 8.3, 11.3, 14.5 and 13.6 eV respectively. Which of these is the IE of nitrogen?


704) Which oxide is amphoteric in nature?


705) The correct ionic radii order is:


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


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


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


709) The correct increasing covalent nature is:


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


711) The species having octahedral shape is:


712) Which of the following is not isoelectronic?


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


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


715) Which molecule is T-shaped?


716) Organic compounds soluble in water contain:


717) Which of the following is most stable?


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


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


720) Which one of the following arrangements represents the correct order of electron gain enthalpy (with negative sign) of the given atomic species?


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


722) Which one of the following has the highest electronegativity?


723) The molecule having permanent dipole moment is:


724) Statement 1: Manganese has a less favourable electron affinity than its neighbours in either side.
Statement 2: The magnitude of an element's electron affinity depends on the element's valence shell electrons configuration.


725) Statement 1: The electron attachment enthalpy of fluorine is more negative than that of chlorine.
Statement 2: All alkaline earth and noble gas elements have positive value of electron attachment enthalpies.


726) Statement 1: Atomic size of silver is almost equal to that of gold.
Statement 2: d-subshell has low penetration power and produce poor shielding.


727) Statement 1: In any period, the radius of the noble gas is lowest.
Statement 2: He has the highest IE in the Periodic Table.


728) Statement 1: First ionization energy for nitrogen is lower than oxygen.
Statement 2: Across a period effective nuclear charge decreases.


729) Statement 1: The first ionization energy of Be is greater than B.
Statement 2: 2p- orbitals have lower energy than 2s- orbitals


730) Statement 1: Known elements may contain as many as 32 electrons in an energy level but only s and p sublevel electrons are considered for the octet rule.
Statement 2: For any atom, electrons present in s- and p- subshells assume greater stability.


731) Statement 1: Plutonium among the transuranic elements is the longest lived element.
Statement 2: Plutonium is not radioactive.


732) Statement 1: Sulphur atom has higher electron affinity than oxygen.
Statement 2: Oxygen is more electronegative than sulphur, that's why can hold electron better.


733) Statement 1: Nobel gases have large positive electron gain enthalpy.
Statement 2: Electron has the enter the next higher principal quantum level.


734) Statement 1: Shielding effect increases as we go down the group.
Statement 2: More is the electrons in the penultimate shell, more is shielding.


735) Statement 1: Isoelectronic species are having same number of electrons but different radii.
Statement 2: Higher the charge, smaller the ion.