11th class (FSc) chemistry Unit 6 MCQs
26. The carbon atoms in C2H4 is
a. SP hybridized
b. SP3 hybridized
c. Dsp2 hybridized
d. SP2 hybridized
27. In sp2 hybridization, the orbitals are oriented at an angle of:
a. 180o
b. 109.5o
c. 0o
d. 102o
28. Total number of bonds in C2H4 molecule are:
a. Five
b. Six
c. Eight
d. Four
29. Which molecule has sp2 hybridization?
a. C2H2
b. CH4
c. C2H6
d. C2H4
30. Total number of sigma bonds in ethyne are:
a. Two
b. Five
c. Four
d. Three
31. In ethyne carbon atom is hybridized:
a. Dsp2
b. SP3
c. SP
d. SP2
32. In ethyne molecule, the number and nature of bonds are:
a. Three sigma two pi
b. One sigma two pi
c. Two sigma two pi
d. Two sigma one pi
33. MOT was propesed by:
a. Kossel
b. Moseley
c. Mulliken
d. Werner
34. The paramagnetic property of oxygen is well-explained on the basis of:
a. MO theory
b. VSEPR
c. VB theory
d. None of these
35. The bond order of N2 according to MO theory is:
a. 2
b. Zero
c. 3
d. 1
36. Which one of the following molecule is paramagnetic?
a. N2
b. H2
c. O2
d. He
37. Which statement is not correct regarding bonding molecular orbitals:
a. every electron in the bonding molecular orbitals contributes to the attraction between atoms
b. Bond molecular orbitals possess less energy than atomic orbitals from which they are formed
c. Bonding molecular orbitals are formed when the electron waves undergo constructive interference
d. Bonding molecular orbitals have low electron density between the two nuclei
38. Which one of the hydrogen halides is more acidic?
a. HCl
b. HF
c. HBr
d. HI
39. The H-H bond energy in KJ mol-1 is:
a. 463
b. 346
c. 336
d. 436
40. Carbon dioxide and methane have dipole moment value:
a. Both have zero
b. Zero and 1.85 D
c. 1.70 D and 180
d. None of these
41. Dipole moment of CO2:
a. 0.95 D
b. 1.84 D
c. 2.2 D
d. Zero D
42. S.I unit of dipole moment is:
a. mC
b. Pm
c. Debye
d. All
43. Which of the following molecule has zero dipole moment:
a. H2O
b. NH3
c. BF3
d. CHCl3
44. The dipole moment of CH4 is:
a. Zero D
b. 1.85 D
c. 1.61 D
d. 0.95 D
45. …… is the hydrogen halide which as the highest percentage of ionic character:
a. HF
b. HCL
c. HI
d. HBr
46. …… molecules has zero dipole moment:
a. SO2
b. CO
c. CH4
d. H2S
47. Which of the following has linear structure?
a. CH4
b. CO2
c. H2O
d. NH3
48. Percentage ionic character HF is:
a. 43%
b. 100%
c. 57%
d. 80%
49. It has net dipole moment:
a. NH3
b. CCl4
c. CO2
d. BF3
50. An ionic compound A+B– is the most stable likely to be formed when:
a. Both ionization energy and electron affinity B are high
b. The ionization energy of A is high and electron affinity B is low
c. Both ionization energy and electron affinity B are Slow
d. The ionization energy of A is low and electron affinity B is high