Chemical Bonding MCQs | Chemical Bonding Short Questions(MCQs) & Answers

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Questions
41 Which of the following species has maximum number of lone-pair of electrons on the central atom ?
A XeF2
B H3O+
C XeF4
D XeF6

Answer: XeF2
42 PCl5 is highly unstable and in solid state it exists as into [PCl4]+ and [PCl6]- ions. The geometry of [PCl6]- is
A octahedral
B tetrahedral
C square pyramidal
D square planar

Answer: octahedral
43 In an octahedral structure, the pair of d orbitals involved in d2sp3-hybridisation is
A dx2−y2, dz2
B dxy, dx2−y2
C dz2, dxz
D dxy, dyz

Answer: dx2−y2, dz2
44 Which of the following is isoelectronic ?
A CO2, NO2
B NO−2, CO2
C CN−, CO
D SO2, CO2

Answer: CN−, CO
45 The dielectric constant of H2O is 80. The electrostatic force of attraction between Na+ and Cl- will be
A reduced to 1/40 in water than in air
B reduced to 1/80 in water than in air
C will be increased to 80 in water than in air
D will remain unchanged

Answer: reduced to 1/80 in water than in air
46 The correct order of C-O bond length among CO, CO2−3, CO2 is
A CO2 < CO2−3< CO
B CO = CO2 < CO2−3
C CO2−3< CO2 < CO
D CO < CO2 < CO2−3

Answer: CO < CO2 < CO2−3
47 In which one of the following molecules, the central atom said to adopt sp2 hybridisation ?
A BeF2
B BF3
C C2H2
D NH3

Answer: C2H2
48 In which of the following pairs, the two species are isostructural ?
A SF4 and XeF4
B SO2−3 and NO−3
C BF3 NF3
D BrO−3 and XeO3

Answer: BrO−3 and XeO3
49 In BrF3 molecule, the lone pairs occupy equatorial positions to minimise :
A lone pair-bond pair repulsion
B bond pair-bond pair repulsion
C lone pair-lone pair repulsion and lone pair-bond pair repulsion
D lone pair-lone pair repulsion

Answer: lone pair-lone pair repulsion
50 In which of the following species the central atom has the type of hybridisation which is not the same as that present in the other three ?
A SF4
B I−3
C SbCl2−5
D PCl5

Answer: SbCl2−5
51 In which of the following molecules are all the bonds not equal ?
A ClF3
B BF3
C AlF3
D NF3

Answer: ClF3
52 Which of the following is not isostructural with SiCl4?
A SCl4
B SO42-
C PO43-
D NH4+

Answer: SCl4
53 Which one of the following is not paramagnetic ?
A NO
B N+2
C CO
D O−2

Answer: CO
54 Which of the following two are isostructural?
A XeF2, and IF2-
B NH3, and BF3
C CO32-, and SO32-
D PCl5, and ICl5

Answer: XeF2, and IF2-

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