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B Sc I SEMESTER -2022 CHEMISTRY, 1, The neutral atoms of all of the isotopes of the same element have, , (a) different numbers of protons., , (b) equal numbers of neutrons., , (c) the same number of electrons., , (d) the same atomic numbers,, 2. The Heisenberg Principle states that ,, , (a) no two electrons in the same atom can have the same set of four quantum numbers., , (b) two atoms of the same element must have the same number of protons., , (c) it is impossible to determine accurately both the position and momentum of an electron, , simultaneously., , (d) electrons of atoms in their ground states enter energetically equivalent sets of orbitals, , singly before they pair up in any orbital of the set., 3. Which statement about the four quantum numbers which describe electrons in atoms, is incorrect?, , (a) n = principal quantum number, n = 1, 2, 3, ......, , (b) / = subsidiary (or azimuthal) quantum number, /= 1, 2, 3, ... , (+1), , (c) m; = magnetic quantum number, m= (-/), ...., 0, .... , (+0), , (d) ms = spin quantum number, m; = +1/2 or -1/2., 4. Which atomic orbital is spherical in shape? (Note: you should know and be able to, recognize the shapes of the s orbital, px, py, and pz orbitals, and dxy, dyz, diz, dx2-y2 and, d,2 orbitals.), , (a) 2s, , (b) 3p, , (c) 3d, , (d) they are all spherical, 5. The maximum number of electrons that can be accommodated in a sublevel for which / = 3, is:, , {a)2, , (b) 10, , (c)6, , (d) 14, 6. Which of the following electron configurations is correct for Cu?, , (a) [Ar] 4s' 30°

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(b) [Kr] 4s' 4a"°, (c) [Ar] 4s" 3d°, (d) [Ar] 4s? 3c®, 7. In the ground state of aCratomthere are__ unpaired electrons andthe atomis___., (a) 6, paramagnetic, (b) 5, paramagnetic, (c) 2, diamagnetic, (d) 0, diamagnetic, 8. Which one of the following sets of quantum numbers could be those of the distinguishing, (last) electron of Cr ?, (a)n=4,/=0, m= 0, m, = +1/2, (b) n= 5, /=1, m=9, m, =-1/2, (c)n =4,/= 2, m=-1, my = 41/2, (d) n= 3, /= 2, m= +2, m, = +1/2, 9. What type of intermolecular forces are due to the attraction between induced dipoles and, their induced dipoles?, (a) metallic bond, (b) London dispersion, (c) hydrogen bond, (d) ionic bond, 10. What type of interparticle forces holds liquid N; together?, (a) ionic bonding, (b) London forces, (c) hydrogen bonding, (d) dipole-dipole interaction, 11. Which response includes only those compounds that can exhibit hydrogen bonding?, CHa, ASHs, CHaNHz, H2Te, HF, (a) AsHs, HoTe, (b) AsHs, CH3NH2, (c) CHs, AsHs, H2Te, (d) CHsNH», HF, 12. Which of the following boils at the highest temperature?, (a) CHa, (b) CoHe

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(c) Cots, (d) Caio, 13. Which of the following compounds would be expected to have the highest melting point?, (a) BaF2, (b) BaCl,, (c) BaBr2, (d) Bal», 14. Which of the following compounds is expected to have the highest lattice energy?, (a) NaCl, (b) NaBr, (c) MgF2, (d) KCI, 15. According to Fajan's rules, the covalent nature of ionic compounds is favoured by, A) Large cation and small anion, B) Large cation and large anion, C) Small cation and large anion, D) Smail cation and smail anion, 16. Even though the crystal radii of both K’ and Ag’ are almost same, the melting point of, AgCl is only 455°C, while that of KCI is 776°C. The best explanation is:, A) AgCl has more ionic character than KCI due to greater polarizing power of potassium ion., B) KCI has more ionic character than AgC! due to greater polarizing power of potassium ion., C) AgC! has more covalent character than KCI due to greater polarizing power of silver ion,, D) KC! has more covalent character than AgC! due to greater polarizing power of silver ion., 17. The order of covalent nature for aluminium halides is AIF; < AlCl; < AlBr; < Alls. The best, explanation according to Fajan's rules is:, A) Al** is larger in size and hence it has greater polarizing power,, B) The polarizability of halide ions increases with increase in their size and hence the covalent, nature also increases., C) The polarizability of halide ions decreases with increase in their size and hence the covalent, nature decreases., D) The given order of covalent nature is due to greater polarizing power of Al’* ion., 18. The correct order of covalent nature of alkali metal chlorides is:, A) LiCl < NaCl < KCI < RbCI < CsCi, B) CsCl < NaCl < KCI < RbCI < LIC!

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C) LiCl > NaCl > KCI > RbCl > CsCl, D) LiCl = NaCl = KCI = RbCI < CsC!, 19. Polarization is the distortion of the shape of an anion by an adjacently placed cation., Which of the following statements is correct:, A) Maximum polarization is brought about by a cation of high charge, B) A large cation is likely to bring about a large degree of polarization, C) Minimum polarization is brought about by a cation of low radius, D) A small anion is likely to undergo a large degree of polarization, 20. Which of the following has a high polarising power, A) Mg”*, B) AI, C) Na*, D) Ca?", 21. Maximum covalent character is associated with the compound:, A) Nal, B) Mgle, C) AICls, D) Alls, 22. According to Fajan's rules, the covalent bond is favored by, A) Large cation and small anion, B) Large cation and large anion, C) Small cation and large anion, D) Smail cation and small anion, 23. Polarisibility of halide ions increases in the order, A) F-,1-,Br-,ClB) Cl-,Br-,1-,FC) |-,Br-,CL,FD) F-,Cl-,Br-,|24. Amongst LiCl, RbC/, BeCl, and MgCl: the compounds with the greatest and the least, ionic character, respectively, are:, A) LiCl and RbC!, B) RbCI and BeClz, C) RbCI and MgCl,, D) MgCl: and BeClz

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25. Polarization power of cation increases when :, A) size decrease, B) size increases, C) Anion has greater polarizing power, D) covalent nature increases