(b) electrovalent and covalent (c) electrovalent and co-ordinate (d) covalent and co-ordinate 10. Which pair is different from others (a) Li Mg (b)

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Bernard Sims
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1 1. Following triads have approximately equal size (a) Na+, Mg 2+, Al 3+ (iso-electronic) (b) F, Ne, O 2 (iso-electronic) (c) Fe, Co, Ni (d) Mn+, Fe 2+, Cr (iso-electronic) 2. Which of the following halides is not oxidised by MnO 2? (a) F (b) Cl (c) Br (d) I 3. When the following five anions are arranged in the order of decreasing ionc radius, the correct sequence is (a) Se 2, I, Br, O 2, F (b) I, Se 2, O 2, Br, F (c) Se 2, I, Br, F, O 2 (d) I, Se 2, Br, O 2, F 4. An element M has an atomic number 9 and atomic mass 19. Its ion will be presented by (a) M (b) M 2+ (c) M (d) M 2 5. The correct order of increasing ionic character is (a) BeCl 2 <MgCl 2 <CaCl 2 < BaCl 2 (b) BeCl 2 <CaCl 2 <MgCl 2 < BaCl 2 (c) BaCl 2 <CaCl 2 <MgCl 2 < BeCl 2 (d) MgCl 2 <CaCl 2 < BeCl 2 < BaCl 2 6. Consider the following statements (I) Cs + is more highly hydrated than the other alkali metal ion (II)Among the alkali metals Li, Na, K and Rb, lithium has the highest melting point (III) Among the alkali metals only lithium forms a stable nitride by direct combination. (a)(i), (II) and (III) are correct (b)(i) and (II) are correct (c)(i) and (III) are correct (d)(ii) and (III) are correct 7. The incorrect order of acid strength is (a) Cl 2 O 7 > SO 2 > P 4 O 10 (b) CO 2 > N 2 O 5 > SO 3 (c) Na 2 O > MgO > Al 2 O 3 (d) K 2 O > CaO > MgO 8. The correct order of radii is (a) N < Be < B (b) F < O 2 < N 3 (c) Na < Li < K (d) Fe 3+ < Fe 2+ < Fe The type of bonds present in CuSO 4.5H 2 O are (a) electrovalent, covalent and co-ordinate

2 (b) electrovalent and covalent (c) electrovalent and co-ordinate (d) covalent and co-ordinate 10. Which pair is different from others (a) Li Mg (b) Na K (c) Ca Mg (d) B Al 11. The process requiring absorption of energy is (a) F F (b) Cl Cl (c) O O 2 (d) H H 12. The electron affinities of N, O, S and Cl are such that (a) N < O < S < Cl (b) O < N < Cl < S (c) O» Cl < N» S (d) O < S < Cl < N 13. Following are the values of the electron affinities of the formation of O and O 2 from O (a) 142, 702 (b) 142, 702 (c) 142, 702 (d) 142, For the element (X), student (A) measured its radius as 102 nm, student (B) as 103 nm and (C) as 100 nm using same apparatus. Their teacher explained that the measurements were correct by saying that recorded values by (A), (B) and (C) are (a) crystal, van der Waal and covalent radii (b) covalent, crystal and vander Waal radii (c) van der Waal, ionic and covalent radii (d) None is correct 15. The correct order of ionic radii of Y 3+, La 3+, Eu 3+ and Lu 3+ is (a) Y 3+ < Lu 3+ < Eu 3+ < La 3+ (b) Lu 3+ < Eu 3+ < La 3+ < Y 3+ (c) La 3+ < Eu 3+ < Lu 3+ < Y 3+ (d) Y 3+ < La 3+ < Eu 3+ < Lu 3+ [Hint: Eu and Lu are the members of lanthanides series. Due to the lanthanide contraction, the sizes of Eu, Lu and La will follow the order, Lu < Eu < La. The element Y belongs to the fifth period while Lu belongs to the sixth period. We expect their sizes will follow the order Y < Lu.] 16. The basic character of the transition metal monoxides follows the order (a) CrO > VO > FeO > TiO (b) TiO > FeO > VO > CrO (c) TiO > VO > CrO > FeO (d) VO > CrO > TiO > FeO 17. Identify the correct order of solubility of Na 2 S, CuS and ZnS in aqueous medium (a) CuS > ZnS > Na 2 S (b) ZnS > Na 2 S > CuS (c) Na 2 S > CuS > ZnS (d) Na 2 S > ZnS > CuS

3 18. Identify the correct order of acid strengths of CO 2, CuO, CaO, H 2 O (a) CaO < CuO < H 2 O < CO 2 (b) H 2 O < CuO < CaO < CO 2 (c) CaO < H 2 O < CuO < CO 2 (d) H 2 O < CO 2 < CaO < CuO 19. In which of the following molecules would you expect the nitrogen-to-nitrogen bond to be the shortest? (a) N 2 H 4 (b) N 2 (c) N 2 O 4 (d)n 2 O U(III) B changes to 234 Th by emisstion of a particle. Daughter element will be in (a) III B (b) I B (c) V B (d) II A 21. Which one of the following is smallest in size? (a) Na+ (b) O 2 (c) N 3 (d) F 22. Inert pair effect is shown by (a) s - block (b) p - block (c) d - block (d) f - block 23. Of the following elements, which one has the highest electronegativity? (a) I (b) Br (c) Cl (d) F 24. Which is correct order of size of O, O 2, F and F (a) O 2 > O > F > F (b) O > O 2 > F > F (c) O 2 > F > F > O (d) O 2 > F > O > F 25. Aluminium is diagonally related to (a) Li (b) Si (c) Be (d) B 26. The electronegativities of N, C, Si and P are such that (a) P < Si < C < N (b) Si < P < N < C (c) Si < P < C < N (d) P < Si < N < C 27. Which of the following transitions involves maximum energy? (a) M (g) M (g) (b) M 2+ (g) M 3+ (g) (c) M+ (g) M 2+ (g) (d) M (g) M+ (g) 28. The electronegativity of cesium is 0.7 and that of fluorine is 4.0. The bond formed between the two is (a) covalent (b) electrovalent (c) co-ordinate (d) metallic

4 29. Delocalised molecular orbitals are found in (a) H 2 (b) HS (c) CH 4 (d) CO Which of following elements has the strongest tendency to form electrovalent compound? (a) Li (b) Na (c) Be (d) Mg 31. (A) Tetracyanomethane (B) Carbon dioxide (C) Benzene (D) 1, 3 butadiene Ratio of σ and π bonds is in order (a) A = B < C < D (b) A = B < D < C (c) A = B = C = D (d) C < D < A < B 32. In sp 3 d hybridisation, the d-orbital that participates in hybridisation is (a) dx 2 y 2 (b) dz 2 (c) dxy (d) dxz 33. Among KO 2, AlO 2, BaO 2 and NO 2 +, unpaired electron is present in (a) KO 2 only (b) NO 2 + and BaO 2 (c) KO 2 and AlO 2 (d) BaO 2 only 34. Which of the following molecular orbitals in N 2 has least energy? (a) π2π (b) σ2π z (c) σ2σ (d) π2πz* 35. C 2 C 3 sigma single bond in vinyl acetylene is due to overlapping of (a) sp sp (b) sp 2 sp 2 (c) sp sp 2 (d) sp 2 sp 36. In the compounds of type ECl 3, where E = B, P, As or Bi the angles Cl E Cl for different E are in the order (a) B > P = As = Bi (b) B > P > As > Bi (c) B < P = As = Bi (d) B < P < As < Bi 37. When N 2 + is formed, from N 2 bond order... and when O 2 + is formed from O 2, bond order... (a) increases (b) decreases (c) increases, decreases (d) decreases, increases 38. A π-bond is formed by the overlap of (a) s-s orbitals (b) s-p orbitals

5 (c) p-p orbitals in end to end fashion (d) p-p orbitals in sidewise manner. 39. Mg 2 C 3 reacting with water forming propyne C 4 3, which has (a) two sigma and two pi - bonds (b) three sigma and one pi- bond (c) two sigma and one pi- bond (d) two sigma and three pi- bonds 40. Which shows the highest lattice energy? (a) RbF (b) CsF (c) NaF (d) KF 41. The correct order of the O O bond length in O 2, H 2 O 2 and O 3 is (a) O 3 > H 2 O 2 > O 2 (b) O 2 > H 2 O 2 > O 3 (c) O 2 > O 3 > H 2 O 2 (d) H 2 O 2 > O 3 > O The percentage ionic character of a bond having Å as its length, and 1.03D its dipole moment, will be (a) 8.63% (b) 6.83% (c) 3.68% (d) 16.83% 43. Among the species, identify the isostructureal pairs: NF 3, NO 3, BF 3, H 3 O +, HN 3 (a)[nf 3, NO 3 ] and [BF 3, H 3 O+ ] (b)[nf 3, HN 3 ] and [NO 3, BF 3 ] (c)[nf 3, H 3 O+] and [NO 3, BF 3 ] (d)[nf 3, H 3 O+] and [HN 3, BF 3 ] 44. Molecular shapes of SF 4, CF 4 and XeF 4 are (a) the same, with 2, 0 and 1 lone pair of electrons respectively (b) the same, with 1, 1 and 1lone pair of electrons respectively (c) different with 0, 1 and 2 lone pair of electrons respectively (d) different with, 0 and 2 lone pair of electrons respectively 45. The coupling between base units of DNA is through (a) hydrogen bonding (b) electrostatic bonding (c) covalent bonding (d) Vander Waal s forces 46. Which of the following is not true for resonance? (a) identical bonding (b) identical arrangement of atoms (c) same number of paired electrons (d) structure with same energies 47. In which of the following molecules the bond angle is maximum? (a) CH 4 (b) H 2 O (c) NH 3 (d) CO The HOMO in CO is

6 (a) π - bonding (b) σ - bonding (c) π - anti bonding (d) σ - anti bonding 49. CO 2 is isostructural with (a) SO 2 (b) HgCl 2 (c) C 2 H 2 (d) SnCl Allyl cyanide has (a) 9 s - bonds and 4 p - bonds (b) 9s- bonds, 3p- bonds and one lone pair (c) 8 s - bonds and 5 p - bonds (d) 8 s - bonds, 3 p- bonds 51. A molecule possessing dipole moment is (a) CH 4 (b) H 2 O (c) BF 3 (d) CO Correct order of dipole moment is (a) I = II = III (b) I < II < III (c) I > II > III (d) II < III < I 53. Which of the following is the most polar bond? (a) Cl Cl (b) N F (c) C F (d) O F 54. If a molecule MX 3 has zero dipole moment, the sigma bonding orbitals used by M are (a) pure p (b) sp hybrids (c) sp 2 hybrids (d) sp 3 hybrids 55. Mg SO 4 is soluble while BaSO 4 is insoluble in H 2 O. This is because (a) lattice energy of BaSO 4 is greaterthan MgSO 4 (b) BaSO 4 is more covalent than MgSO 4 (c) hydration energy of Mg 2+ is greater than Ba 2+ (d) lattice energy of MgSO 4 is greater than BaSO The molecule which has highest dipole moment amongst the following is (a) CH 3 Cl (b) CH 2 Cl 2 (c) CHCl 3 (d) CCl Which of the following is diamagnetic? (a) O 2 + (b) O 2 (c) O 2 (d) O Which of the following have identical bond order (I) CN (II) O 2 (III) NO+ (IV) CN+ (a) I, II (b) II, IV (c) I, II, III (d) I, IV 59. Which contains both polar and non-polar covalent bonds? (a) NH 4 Cl (b) HCN (c) H 2 O 2 (d) CH The shape of sulphate ion is (a) hexagonal

7 (b) square planar (c) trigonal bipyramidal (d) tetrahedral Answer Keys 1. (c) 2. (a) 3. (d) 4. (c) 5. (a) 6. (d) 7. (a) 8. (b) 9. (a) 10. (a) 11. (c) 12. (a) 13. (b) 14. (a) 15. (a) 16. (c) 17. (d) 18. (a) 19. (b) 20. (a) 21. (a) 22. (b) 23. (d) 24. (a) 25. (c) 26. (c) 27. (b) 28. (b) 29. (d) 30. (b) 31. (a) 32. (b) 33. (a) 34. (c) 35. (d) 36. (b) 37. (d) 38. (d) 39. (a) 40. (c) 41. (d) 42. (d) 43. (c) 44. (d) 45. (a) 46. (a) 47. (d) 48. (b) 49. (c) 50. (b) 51. (b) 52. (d) 53. (c) 54. (c) 55. (c) 56. (b) 57. (d) 58. (a) 59. (c) 60. (d)

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Downloaded from I.I.T.Foundation - XI Chemistry MCQ #4 Time: 45 min Student's Name: Roll No.: Full Marks: 90 Chemical Bonding I. MCQ - Choose Appropriate Alternative 1. The energy required to break a chemical bond to