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Chapter 6
Chemical Bonding
1. Which of the following molecules has a coordinate covalent bond?
- HCI
- NaCl
- NH4Cl
- AICI:
2. The angle formed in sp hybridization is:
- 120o
- 180°
- 109.5o
- 107.5o
3. Ionic compounds are mostly obtained by the combination of group:
- 3 and 5
- 2 and 5
- 4 and 8
- 1 and 7
4. Dipole moment of CO2 is:
- 1.84D
- Zero D
- 0.95 D
- 2.2 D
5. In sp2 hybridization, the orbitals are oriented at an angle of:
- 109.5°
- 120o
- 180°
- 0o
6. Which of the following species has unpaired electron in anti bonding molecular orbitals?
- H2
- He2
- O2+2
- N2-2
7. A molecular orbital can contain maximum electrons equal to:
- One
- Two
- Three
- Four
8. Carbon dioxide and methane have dipole moment value:
- Zero and 1.85. D
- 1.70 D and 1.80 D
- Both have zero
- None of these
9. Nobel gases have maximum stability and least reactive because:
- They are very safe
- Their valence shells are complete
- They are gases
- They are present in zero group
10. Which species has unpaired electron in anti-bonding molecular orbits?
- O2+2
- N22-
- B2
- F2
11. Octet rule is not followed in the formation of:
- NF3
- CF4
- CC14
- PCIS
12. The most stable elements are:
- Halogens
- Lithium family
- Noble gases
- None of these
13. The hybridization of carbon in CzH4 is:
- sp
- sp2
- sp3
- not hybridized
14. Positive ions are called:
- Cations
- Anions
- Molecules
- Hydrated ions
15. Total number of bonds in C2H4 molecule is:
- Six
- Four
- Five
- Eight
16. The S.I unit of dipole moment is:
- Joule
- Debye
- Coulomb meter
- Nm-2
17. Ionic, covalent and co-ordinate covalent bond are present in:
- SO
- NH4CI
- CH2
- H2O
18. The highest electronegative element in the periodic table is:
- Oxygen
- Nitrogen
- Chlorine
- Fluorine
19. Bond angle between H-S-H bonds is:
- 105.5°
- 107.5°
- 92°
- 950
20. S.I Unit of dipole moment is:
- pm
- Debye
- mC
- All
21. The amount of energy released by absorbing electron in the valence shell is:
- Ionization energy
- Electron affinity
- Electro-negativity
- Atomization energy
22. The number of electrons shared in SF6:
- 4
- 12
- 6
- 8
23. Which of hydrogen halides has highest % of ionic character?
- HCI
- HBO
- HF
- HI
24. The geometry of BeCl2 is:
- Linear
- Plane triangular
- Tetrahedral
- None of these
25. Orbitals having same energy are called:
- Hybrid orbitals
- Degenerate orbitals
- Valence orbitals
- Molecular orbitals
26. The four equivalent sp3 hybrid orbitals in space are at angels of:
- 120°
- 107.5°
- 109.5°
- 104.5°
27. Which has unpaired electrons in antibonding molecular orbitals?
- N2-2
- O2+2
- B2
- F2
28. The geometry of ethane is:
- Tetrahedral
- Trigonal planar
- Linear
- V-shaped
29. The paramagnetic property of oxygen is well-explained on the basis of:
- VSEPR theory
- VB theory
- MO theory
- None of these
30. The bond order of Nz according to MO theory is:
- Zero
- 1
- 2
- 3
31. Which of the following compound has a co-ordinate covalent bond?
- NH4Cl
- NaCl
- HCI
- AICI:
32. The carbon atom in C2H4 is:
- sp3 hybridized
- sp2 hybridized
- sp hybridized
- dsp2 hybridized
33. The molecule which can not form co-ordinate covalent bond with H+ ion is:
- NH3
- H2O
- PH3
- CH4
34. Which of the following species has configuration of Neon?
- Na
- Ca+2
- C
- None of these
35. The hybridization of carbon in CH4 is:
- sp
- sp2
- sp3
- dsp3
36. M.O.T was proposed by:
- Moseley
- Werner
- Kossel
- Mullikan
37. The number of bonds in Nitrogen molecule is:
- One sigma and one Pi
- One sigma and two Pi
- Three sigma only
- Two sigma and one Pi
38. The geometry of ethane is:
- Tetrahedral
- Trigonal planner
- Linear
- V-shaped
39. In Al2O3 the ratio between the ions is:
- 1:2
- 2:1
- 2:3
- 3:2
40. VSEPR theory was proposed by:
- Nyholm and Gillespie
- Kossel
- Lewis
- Sidgwick
41. O2 molecule is paramagnetic because:
- Bonding electrons are equal to the anti-bonding electrons
- Bonding electrons are more than anti-bonding electrons
- Bonding electrons are less than anti-bonding electron
- It contains un paired electrons
42. NH3 has a net dipole moment, but BF3 has zero dipole movement because:
- B is less electronegative than N
- Fis more electronegative than N
- BF3 is pyramidal while NH3 is planar
- NH3 is pyramidal while BF3 is trigonal planar
43. The number of bonds in oxygen molecule is:
- One sigma and one Pi-bond
- Two sigma bonds
- Two pi-bonds
- None of these
44. Which of the following molecule has zero dipole moment?
- NH3
- CHA3
- H2O
- BF3
45. When two atoms form a bond, energy is:
- Released
- Absorbed
- Not changed
- None of these
46. Maximum electronegativity is of:
- N
- F
- O
- CI
47. The bond energy of hydrogen molecule is kJ/mole:
- 436
- 440
- 420
- 460
48. The value of dipole moment of CS2 is:
- 0.12D
- Zero
- 1.61 D
- 0.95 D
49. The nature of bond in diamond is:
- Electrovalent
- Covalent
- Metallic
- Coordinate covalent
50. Octet rule is not followed in formation of:
- NF3
- CF4
- CCl4
- PCIE
51. The shielding effect is responsible for:
- The decrease in nuclear attractive influence over the valence electrons
- The increase in nuclear attractive influence over the valence electrons
- The decrease repulsion between nucleus and inner electrons
- The increase in attraction between nucleus and inner electrons.
52. The elements having low ionization energy are:
- Non-metal
- Metals
- Semi-metal
- Metalloids
53. Which of the following is not isoelectronic with rest of the three?
- K+
- Na+
- CL–
- S-2
54. Which of the hydrogen halides has the highest percentage of acid character:
- HCI
- HBr
- HF
- HI
55. The four equivalent sp3 hybrid orbitals in space are at an angel of:
- 120°
- 107.50
- 104.50
- 109.50
56. Total number of sigma bonds in Ethyne (CH=CH) are:
- Five
- Three
- Two
- Four
57. Bond formed by mutual sharing of electrons is called:
- Tonic bond
- Covalent bond
- Co-ordinate covalent bond
- All of these
58. Formation of chemical bond takes place when:
- Energy is absorbed
- Forces of repulsion overcome forces of attraction
- Forces of attraction are equal to forces of repulsion
- Forces of attraction overcome forces of repulsion