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Chapter 6

Chemical Bonding

1. Which of the following molecules has a coordinate covalent bond?

1. HCI
2. NaCl
3. NH₄Cl
4. AICI:

2. The angle formed in sp hybridization is:

1. 120^o
2. 180°
3. 109.5^o
4. 107.5^o

3. Ionic compounds are mostly obtained by the combination of group:

1. 3 and 5
2. 2 and 5
3. 4 and 8
4. 1 and 7

4. Dipole moment of CO2 is:

1. 1.84D
2. Zero D
3. 0.95 D
4. 2.2 D

5. In sp² hybridization, the orbitals are oriented at an angle of:

1. 109.5°
2. 120^o
3. 180°
4. 0^o

6. Which of the following species has unpaired electron in anti bonding molecular orbitals?

1. H₂
2. He₂
3. O₂⁺²
4. N₂^-2

7. A molecular orbital can contain maximum electrons equal to:

1. One
2. Two
3. Three
4. Four

8. Carbon dioxide and methane have dipole moment value:

1. Zero and 1.85. D
2. 1.70 D and 1.80 D
3. Both have zero
4. None of these

9. Nobel gases have maximum stability and least reactive because:

1. They are very safe
2. Their valence shells are complete
3. They are gases
4. They are present in zero group

10. Which species has unpaired electron in anti-bonding molecular orbits?

1. O₂⁺²
2. N₂^2-
3. B₂
4. F₂

11. Octet rule is not followed in the formation of:

1. NF₃
2. CF₄
3. CC₁₄
4. PCI_S

12. The most stable elements are:

1. Halogens
2.  Lithium family
3. Noble gases
4. None of these

13. The hybridization of carbon in CzH4 is:

1. sp
2. sp²
3. sp³
4. not hybridized

14. Positive ions are called:

1. Cations
2. Anions
3. Molecules
4. Hydrated ions

15. Total number of bonds in C₂H₄ molecule is:

1. Six
2. Four
3. Five
4. Eight

16. The S.I unit of dipole moment is:

1. Joule
2. Debye
3. Coulomb meter
4. Nm^-2

17. Ionic, covalent and co-ordinate covalent bond are present in:

1. SO
2. NH₄CI
3. CH₂
4. H₂O

18. The highest electronegative element in the periodic table is:

1. Oxygen
2. Nitrogen
3. Chlorine
4. Fluorine

19. Bond angle between H-S-H bonds is:

1. 105.5°
2. 107.5°
3. 92°
4. 95⁰

20. S.I Unit of dipole moment is:

1. pm
2. Debye
3. mC
4. All

21. The amount of energy released by absorbing electron in the valence shell is:

1. Ionization energy
2. Electron affinity
3. Electro-negativity
4. Atomization energy

22. The number of electrons shared in SF6:

1. 4
2. 12
3. 6
4. 8

23. Which of hydrogen halides has highest % of ionic character?

1. HCI
2. HBO
3. HF
4. HI

24. The geometry of BeCl₂ is:

1. Linear
2. Plane triangular
3. Tetrahedral
4. None of these

25. Orbitals having same energy are called:

1. Hybrid orbitals
2. Degenerate orbitals
3. Valence orbitals
4. Molecular orbitals

26. The four equivalent sp3 hybrid orbitals in space are at angels of:

1. 120°
2. 107.5°
3. 109.5°
4. 104.5°

27. Which has unpaired electrons in antibonding molecular orbitals?

1. N₂^-2
2. O₂⁺²
3. B₂
4. F₂

28. The geometry of ethane is:

1. Tetrahedral
2. Trigonal planar
3. Linear
4.  V-shaped

29. The paramagnetic property of oxygen is well-explained on the basis of:

1. VSEPR theory
2. VB theory
3. MO theory
4. None of these

30. The bond order of Nz according to MO theory is:

1.  Zero
2. 1
3. 2
4. 3

31. Which of the following compound has a co-ordinate covalent bond?

1. NH₄Cl
2. NaCl
3. HCI
4. AICI:

32. The carbon atom in C₂H₄ is:

1. sp³ hybridized
2. sp² hybridized
3. sp hybridized
4. dsp² hybridized

33. The molecule which can not form co-ordinate covalent bond with H+ ion is:

1. NH₃
2. H₂O
3. PH₃
4. CH₄

34. Which of the following species has configuration of Neon?

1. Na
2. Ca⁺²
3. C
4. None of these

35. The hybridization of carbon in CH₄ is:

1. sp
2. sp²
3. sp³
4. dsp³

36. M.O.T was proposed by:

1. Moseley
2. Werner
3. Kossel
4. Mullikan

37. The number of bonds in Nitrogen molecule is:

1. One sigma and one Pi
2. One sigma and two Pi
3. Three sigma only
4. Two sigma and one Pi

38. The geometry of ethane is:

1. Tetrahedral
2. Trigonal planner
3. Linear
4. V-shaped

39. In Al₂O₃ the ratio between the ions is:

1. 1:2
2. 2:1
3. 2:3
4. 3:2

40. VSEPR theory was proposed by:

1. Nyholm and Gillespie
2. Kossel
3. Lewis
4. Sidgwick

41. O₂ molecule is paramagnetic because:

1. Bonding electrons are equal to the anti-bonding electrons
2. Bonding electrons are more than anti-bonding electrons
3. Bonding electrons are less than anti-bonding electron
4. It contains un paired electrons

42. NH₃ has a net dipole moment, but BF₃ has zero dipole movement because:

1. B is less electronegative than N
2. Fis more electronegative than N
3. BF₃ is pyramidal while NH₃ is planar
4. NH₃ is pyramidal while BF₃ is trigonal planar

43. The number of bonds in oxygen molecule is:

1. One sigma and one Pi-bond
2. Two sigma bonds
3. Two pi-bonds
4. None of these

44. Which of the following molecule has zero dipole moment?

1. NH₃
2. CHA₃
3. H₂O
4. BF₃

45. When two atoms form a bond, energy is:

1. Released
2. Absorbed
3. Not changed
4. None of these

46. Maximum electronegativity is of:

1. N
2. F
3. O
4. CI

47. The bond energy of hydrogen molecule is kJ/mole:

1. 436
2. 440
3. 420
4. 460

48. The value of dipole moment of CS2 is:

1.  0.12D
2. Zero
3. 1.61 D
4. 0.95 D

49. The nature of bond in diamond is:

1. Electrovalent
2. Covalent
3. Metallic
4. Coordinate covalent

50. Octet rule is not followed in formation of:

1. NF₃
2. CF₄
3. CCl₄
4. PCIE

51. The shielding effect is responsible for:

1. The decrease in nuclear attractive influence over the valence electrons
2. The increase in nuclear attractive influence over the valence electrons
3. The decrease repulsion between nucleus and inner electrons
4. The increase in attraction between nucleus and inner electrons.

52. The elements having low ionization energy are:

1. Non-metal
2. Metals
3. Semi-metal
4. Metalloids

53. Which of the following is not isoelectronic with rest of the three?

1. K⁺
2. Na⁺
3. CL^–
4. S^-2

54. Which of the hydrogen halides has the highest percentage of acid character:

1. HCI
2. HBr
3. HF
4. HI

55. The four equivalent sp³ hybrid orbitals in space are at an angel of:

1. 120°
2. 107.5⁰
3. 104.5⁰
4. 109.5⁰

56. Total number of sigma bonds in Ethyne (CH=CH) are:

1. Five
2. Three
3. Two
4. Four

57. Bond formed by mutual sharing of electrons is called:

1. Tonic bond
2. Covalent bond
3. Co-ordinate covalent bond
4. All of these

58. Formation of chemical bond takes place when:

1. Energy is absorbed
2. Forces of repulsion overcome forces of attraction
3. Forces of attraction are equal to forces of repulsion
4. Forces of attraction overcome forces of repulsion