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Home/ Chemistry/Chemistry MCQ with Answer Explanation : Coordination compounds.

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On: October 14, 2024 Posted in Chemistry, Education, Exam Comments: 0 Views: 488

Chemistry MCQ with Answer Explanation : Coordination compounds.

71. The number of lone pairs on the central atom in SF4 is:

a) 1
b) 2
c) 3
d) 0

Answer: a) 1

Explanation: In sulfur tetrafluoride (SF4), the central sulfur atom has one lone pair and four bonding pairs, resulting in a seesaw shape.

72. Which of the following molecules contains both sigma (σ) and pi (π) bonds?

a) CH4
b) NH3
c) C2H4
d) H2O

Answer: c) C2H4

Explanation: Ethene (C2H4) has a double bond between the two carbon atoms, which consists of one sigma bond and one pi bond. Each carbon also forms sigma bonds with two hydrogen atoms.

73. Which of the following compounds has a pyramidal shape?

a) NH3
b) BF3
c) CH4
d) CO2

Answer: a) NH3

Explanation: Ammonia (NH3) has a trigonal pyramidal shape due to the presence of three bonding pairs and one lone pair on the nitrogen atom.

74. The correct IUPAC name of CH3CH2CH2OH is:

a) 1-propanol
b) 2-propanol
c) 1-butanol
d) ethanol

Answer: a) 1-propanol

Explanation: The compound has three carbon atoms with a hydroxyl group (-OH) attached to the first carbon. Therefore, the correct IUPAC name is 1-propanol.

75. Which of the following molecules has sp2 hybridization at the central atom?

a) CH4
b) C2H4
c) NH3
d) H2O

Answer: b) C2H4

Explanation: In ethene (C2H4), each carbon atom undergoes sp2 hybridization, forming three sigma bonds and one pi bond, resulting in a planar structure.

76. The hybridization of the central atom in PCl5 is:

a) sp
b) sp2
c) sp3
d) sp3d

Answer: d) sp3d

Explanation: Phosphorus in PCl5 is sp3d hybridized, leading to a trigonal bipyramidal structure with bond angles of 90° and 120°.

77. Which of the following compounds has the highest bond angle?

a) CH4
b) NH3
c) H2O
d) CO2

Answer: d) CO2

Explanation: Carbon dioxide (CO2) is a linear molecule with a bond angle of 180°, which is the highest among the given compounds.

78. Which of the following species has an octahedral geometry?

a) SF4
b) PCl5
c) SF6
d) XeF4

Answer: c) SF6

Explanation: Sulfur hexafluoride (SF6) has an octahedral geometry due to sp3d2 hybridization, with bond angles of 90°.

79. Which of the following molecules is nonpolar?

a) NH3
b) H2O
c) CO2
d) CH3Cl

Answer: c) CO2

Explanation: Carbon dioxide (CO2) is nonpolar because it is a linear molecule, and the dipole moments of the polar C=O bonds cancel each other out.

80. The bond angle in ammonia (NH3) is approximately:

a) 90°
b) 104.5°
c) 107°
d) 120°

Answer: c) 107°

Explanation: In ammonia (NH3), the bond angle is approximately 107° due to the lone pair-bond pair repulsion, which slightly reduces the ideal tetrahedral angle of 109.5°.

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