Page 1 :
A prem ee = a, Ee Multiple Choice Questions, eet erengpeemennente, , 40 Ein, , 1. Chemical bond implies [KCET 2002], , (A) _ attraction, , (B) repulsion, , (C) neither attraction nor repulsion, (D) both (A) and (B), , nw, , Atoms combine to form molecules because, , electrostatic force binds them, , they acquire low energy state, , molecules have more energy than atoms, they tend to acquire stability by, lowering of energy, , , , {A), (B), (Cc), (D), , or), , The general outer electronic configuration of, inert gas is, , (A) as?, , (B) ns‘np*, , (C) ns*(n—1)d°, , (D) either (A) or (B), , 4. Which of the following ions will vores, , inert gas configuration?, (A) S* (B) Liv, uO, , ale, , (Cc) Al*, , 5. Most stable configuration ingh :, , (A) soft metals, (B) zero group elemer e, , (C) halogens, (D) both (A) and Les, 6 Element *X’, wi atoms have an outer shell, , electronic con! tion ns’np*, is most likely, to react chemically to form ions which have a, , , , , , , , charge of ,, (A) 2+ (B) 1+, (C) 1- (D) 2, 7: Valence electrons of an atom are the electrons, (A) present in the outermost shell of an atom, (B) required for the completion of the, , outermost shell, , (C) present in the innermost shell of an atom, (D) equal to its oxidation number, , , , 9., , , , , , 12,, , 13., , , , Which of the following determines, chemical properties of elements?, , (A) Total number of electrons, , (B) Number of neutrons, , (C) The mass number, , (D) The valence electrons, , If the atomic no. of element X is 7. The, , electron dot symbol, for the element is, IB ne 2003; NCERT 1973,, CPM ", -. Xo we ET 20, (A) &X3 (B) Xs, 2 :, (C) 3 (D) Xe, , lency, : [Roorkee 1989,, the transfer of electrons take place, sharing of electrons take place, , ) the electrons are shared by only one atom, , (D) none of these, , The bond polarity between two atoms depends, upon, (A), @), (©), @), A nonpolar pure covalent bond is formed with, elements having “, , (A) same value of electronegativity, , (B) large difference in electronegativity, between them., , the, , , , oxidation potential, reduction potential, electronegativity, electron affinity, , (C) small difference in electronegativity, between them., , (D) none of these., , Boron forms covalent compound due ©, , . [Pb. PET 2001], , (A) small size, , (B) higher ionization energy, , (C) lower ionization energy, , (D) both (A) and (B), , The maximum number of covalent bonds, between two atoms are., , (A) two (B) four, , (C) three (D) six, , Atomic number of silicon is 14, In forming, bonds,, , (A) it loses electrons, , (B) it gains electrons, , (C) it shares electrons, , (D) either (A) or (B), depending upon the, , conditions ith

Page 2 :
ie. Which of the following statements is, » CORRECT for covalent bond? [BHU 1997], (A) Electrons are shared between two atoms, (B) It is non-directional., (C) Electrons are transferred from one atom, to another., , Valence electrons are attracted towards, one atom, , (D), , 17. HCI molecule contains a 3, [CPMT 1984], (A) single covalent bond, (B) double covalent bond, (C) co-ordinate bond, (D) electrovalent bond, , 18. Which of the following has strongest covalent, bond?, (A) H-Cl (B) Cl-Cl, (C) C-Cl (D) Na-Cl, , 19. Which of the following statements regarding, covalent bonding is FALSE?, (A) Pure covalent bond is non-polar., (B) A donor and an acceptor are required., , (C) It is formed by sharing of electrons., (D) It can be polar., , 20. Given the electronic configuration of the three, , elements X, Y and Z:, X: [Ne] 3s!, , Y: [He] 2s’2p?, , Z: [Ne] 3s? 3p*, Molecule which contains covalent bo! ly, , is 5, (B) e@)), (D), , , , (A) X2, (C) Z, , , , 21. Ina double bond connecti toms there, , is a sharing of ., [NCERT 1975;(CPMT 1981, 1983], , (A) 2 electrons 4 electrons, (C) 1 electron 6 electrons, , 22. Ina triple bond, t is sharing of, , © (A) 3 electro; (B) 4 electrons, (C) 2ele (D) 6electrons, , 23. The total ‘fuphber of electrons that take part in, bond formation in Nz molecule are ‘, (4) 2 @) 4 © 6 @) 10, , m4. Among the alkaline earth metals, the element, forming predominantly covalent compounds is, ahs IMNR 1986], (A) Be (B) Mg, , ~ © sr (D) Ca, , wP, , , , 30., , 31., , 32., , , , , , 25. An example for a diatomic molecule having, double bonds between its atoms is, (A) oxygen (B) fluorine, (C) nitrogen (D) hydrogen, 26. Which contain3.a triple bond?, (A) SO; (B) HCN, (C) NH (D) C2Hy, 27. Covalent compounds general ., (A) low melting points and\are soluble in, polar solvents, (B) low melting ofa 3nd are insoluble in, polar solvents, (C) high melting’points and are soluble in, polar sol, (D) high giéiting points and are insoluble in, pol Cae, 28. Conithecaoceis in water are generally, [CPMT 1987], ( uble (B) insoluble, Beene. (D) hydrolyzed, 29, he _ example of solid covalent, ment/compound is ‘, A) iron, (B) copper, ie (C) sodium chloride, , (D) diamond, , Which of the following properties would, suggest that a compound under investigation is, covalent? [Pb CET 1992], (A) It conducts electricity on melting., , (B) _ It is soluble in non-polar solvents., , (C) Ithas a high melting point., , (D) It is a compound of a metal and a non, metal., , Covalent compounds have low melting point, , because [KCET 2002], , (A) covalent bond is less exothermic, , (B) covalent molecules have definite shape, , (C) covalent bond is weaker than ionic bond, , (D) covalent molecules are held by weak, van der Waal’s force of attraction, , Which of the following is NOT a, , characteristic of covalent compounds?, , (A) It has low melting point and boiling, point., , (B) It is formed between two atoms having, , no or very small electronegativity, , difference., , They have no definite geometry., , They are generally insoluble in water., , (C), (D)

Page 3 :
33., , 34., , 35., , 36., , 37., , , , 38., , 39., , 41., , , , , , Two elements have electronegativities of, 1.2 and 3.0. Bond formed between them, , , , would be [CPMT 1982], (A) ionic (B) _ polar covalent, (C) co-ordinate (D) metallic, , A bond is said to be ionic, when the difference, in the electronegativity value of the, participating atoms is, (A) equal to 1, , (C) more than 1.7, , less than 1.7, less than |, , , , (B), Q), For the formation of covalent bond, the, , difference in the value of electronegativities, should be 5, , (A) _ nearly or equal to 1.7, , (B) less than 1.7, , (C) more than 1.7, , (D) none of these, , The covalent character of the bond is, maximum in case of ., , (A) H-I (@) H-Br, , ( H-C @) H-F, , Sodium chloride is an ionic compound, whereas hydrogen chloride gas is mainly, covalent because : [KCET 2002] °, , , , , , , , xx, (A) electronegativity difference in the case eo (@) H-Q-H, , of hydrogen chloride is 0.9 . Pa 9, (B) hydrogen chloride is a gas S 45. Which one of the following is NOT correct?, (C) hydrogen is a non-metal . [TS EAMCET(Med.) 2015}, (D) sodium is reactive < (A) Formal charges help in the selection of, Which of the following contains tf eopatent the lowest energy structure of molecule., and ionic bonds? (B) Formal charges indicate real charge, , [KCET 2000; As: 2017) separation within the molecule., , (A) NHLCI ¢ Key (C) Formal charges of each atom of, (C) CCh ¢ 1, polyatomic ion can be calculated., , , . 1 tai (D) Number of unshared electrons on the, Ammonium chloride” molecule contains atoms is also considered for calculation, (A) covalent andor onds of formal charges., , (B) covalent and inate bonds 46. Which of the following is the correct electron, (C) covalent, ionic and co-ordinate bonds dot structure of N20 molecule?, , (D) purely lent bonds [KCET 2017], Which the following compounds contains (A) IN=N=62 (B) tn=eN=08, both s Well as covalent bond? Cc) 4 : D, , (A) (B) (C) SN=N=Q9 (D) 3N=N=Q, ©) BEN ©) KCl 47. According to octet rule, the number of, Which of the following is ionic as well as electrons in the valence shell of central atom, covalent? [Haryana 1999] of the molecule is, , (A) H,0 (B) NaOH (A) 4 (B) 2, , (©) CO, (D) H,0, (©) 6 @) 8, , 42.", , 43., , 44,, , . < . (© is electron from hydrogen and x is, ~ tron from oxygen), , 4, CS (©) HiOxH, , Indicate the nature of bonding in CaH) ang, CCl. [NCERT 1973), , (A) Electrovalent in both CaH, and CCl,, , (B) Co-ordinate in CaH, and covalent jp, CCl,, , (C) Electrovalent in CaH, covalent in, CCl,, , (D) Covalent in CaH, and eléctrovalent in, CCly, , The type of covalent b, electrons in the s!, atom is called, , in which both the, air come from one, , , , , , , , (A) ionic, , (B) ond, (C) b id (B), (), , , , ctron dot structure of water molecule is, , (A) HxOxH (B) HxQ?H

Page 4 :
in, , 348., , , , , , agi kand deca tinstcoibata try, , 49., , 50., , 51., , $2., , 53., , 54,, , , , , , valence electron shell is completed when K, , shell has 2 electrons and the ee, Te, have 8 electrons. This is known ae Ele, , (A) Aufbau’s principle, (B) Octet rule, , (C) Hund’s rule, , (D) Newland’s law, , In boron trifluoride, boron atom has, electrons in the outermost orbit., (A) 4 (B) 6, © 8 (D) 4, , Which of the following compounds does NOT, follow octet rule?, , , , (A) CO2 (B) PC, , (Cc) Ic (D) CIF;, , The octet rule is NOT valid for the molecule, 2 . [IIT 1979], , (A) COz (B) BF;, , (C) (D) CO ., , Which of the following is NOT an exception, of octet rule?, , (A) PCls (B) SFs, , (C) BeCh (D) CHa, , Which of the following molecules is NOT an, , exception to octet rule?, , (A) BF; (B) PFs S, , (C) COz @) IF 4, , Total number of lone pairs of ele in, ? og, , J, ion is ?, , DEE (vain 2018), (A) 3 B, , (©) 9 (D, , How many electro! inium has in its, outermost Shell in Rea chloride?, , (A) 4 ) 3, , © 6 K (D) 8, , The octet of tral ion is expanded in the, case of, , (A) PCR (B) MgCh, , (C) AICh (D) SFs, , to explain _____—, , Octet rule is inadequate r, 2 anded octet in some, , (A) incomplete and exP, molecules :, the geometry of the mo!, , difference in energies of, , @), (©), , , , , ap, 58., , 59., , 60., , 61., , , , a4 | Io, , 62., , 63., , 64., , 65., , , , e, , SF, and BeCl, form respectively, , (A) incomplete and expanded octets, (B) expanded and incomplete octets, (C) covalent and ionic compounds, (D) ionic and coordinate compounds, , In SF,, sulphur has electrons in its, , outermost shell., , (A) 10 i) rv, , I en AV, the following, , rbit contains more, , In central atom of, compounds, the out, than 8 electrons?, (A) AICI, , (C) PCls, , The octe', , (B) CCl, (D) BFs, , dogs NOT explain, (i) ‘the nat of valence forces, (ii) ation of co-ordinate bond, , (ii i Beometry of the molecule, thé reactivity of bonds, ‘A) i) and (iv), , , , ) (i, (iii) and (iv), Go (i), (i) and (iii), (D) _ only (iii), , , , , , Pimms ster oa ce i, , Electrovalent bond is formed by, . (A) _ sharing of electrons, , (B) donation of electron pair, , (C) _ transfer of electrons, , (D) none of these, , The _ interionic, interaction of, , , , attraction depends on, , , , [Kerala PMT 2002], (B) _ solvent-solvent, (D) atomic particles, , solute-solute, the charges, , (A), (©), , In crystal of ionic compounds, cations and, , anions are held together by :, [EAMCET 1982], , electrons, , electrostatic forces, , nuclear forces, , covalent forces, , (A), (B), (C), (), , The crystal lattice of electrovalent compounds, is composed of, , (A) atoms, , (B) molecules, , (C) oppositely charged ions, , (D) _ both molecules and ions, , , , (D) all of these, , ‘492, , Sera

Page 5 :
199. According to valence bond theory, covalent, bond is formed by the overlapping of orbitals, containing, (A) single electron, , (B) paired electrons, (C) _ single electrons with parallel spins, , (D) single electrons with opposite spins, , Which of the following phenomenon will NOT, occur when two atoms of the elements having, parallel spin of electron approach for bonding?, (A) Orbital overlap, , (B) Bonding, , (C) Both (A) and (B) are correct., , (D) None of these are correct., , 200., , 201. According to valence bond theory, which of, , the following is TRUE statement?, (A) The orbitals occupied by electrons in the, , , , , , 204. Which, , 205., , 206. Anat, , of the following statements is, INCORRECT according to the valence bond, theory?, , (A) The number of unpaired electrons, present in the atoms is equal to the, number of covalent bonds formed., , Only the valence shell electrons having, nearly the same energy are involved in, the covalent bond formation., , Geometry of the molecule will be, , decided by the <n nature of the, , @), , (), , overlapping ou, (D) Strength covalent bond is, inversely Boga to the extent of, , overlappi atomic orbitals., , In Be, ho aay electrons are available for, bonding, rding to VBT?, , (A) (B) Two, , © ae (D) None, , ic orbital not having a particular, ion in space is, , valence shell of the central atom lie as sorital () p-orbital, . ') d-orbital (D) f-orbital, far away from one another as possible to KS, impart minimum stability to the 0%. Regarding the formation of a chemical bond,, part gi is, molecule. which of the following is INCORRECT?, (B) Boron should be trivalent. (A) Fi SS a aes are less than the, forces of attraction., (C)_ Carbon should be tetravalent. : (B)_ The forces of attraction are less than the, (D) The number of covalent bonds formed forces of repulsion., equal to the number of unpa (C) Compounds are more stable than, electrons present in the atoms. individual constituent atoms., 202. According to valence bond a of noe r - e vas Be ita, the following is a TRUE statement? Sk 2p eancente Ania nert beoh, ‘ lecule, th tabill, (A) Carbon is bivalent. ~~ meleeate © maximum stability is achieved, (B) Boron is monovalent (A) potential energy of the system is, (C) Beryllium is zerovalent- maximum, (D) All of these (B) potential energy of the system is, ; : 1 minimum, 203. Which of these Bob dg (C) force of repulsion becomes greater than, represent the ground®state of the P force of attraction, as . carbon? (D) no bond formation takes place, ) Te 209. Which condition favours the bond formation?, B ft J. (A) Maximum attraction and maximum, ® tT + — :, potential energy, (B) Minimum attraction and minimum, © Jt xp, 2p. potential energy, Px “Py * (C) Minimum potential energy and, maximum attraction, © t +t —_ (D) None of the above, , , , 2px 2Py 2Pe, , Pans, , —