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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: 487

Chemistry MCQ with Answer Explanation : Coordination compounds.

91. The hybridization of carbon in graphite is:

a) sp
b) sp2
c) sp3
d) None of the above

Answer: b) sp2

Explanation: In graphite, each carbon atom is sp2 hybridized, forming three sigma bonds and one pi bond, which results in a planar structure.

92. The bond angle in CH4 is:

a) 90°
b) 104.5°
c) 107°
d) 109.5°

Answer: d) 109.5°

Explanation: Methane (CH4) has a tetrahedral structure with a bond angle of 109.5° due to sp3 hybridization.

93. The correct IUPAC name of CH3COOH is:

a) Methanoic acid
b) Propanoic acid
c) Butanoic acid
d) Ethanoic acid

Answer: d) Ethanoic acid

Explanation: The compound CH3COOH is ethanoic acid, commonly known as acetic acid. It has two carbon atoms in its structure.

94. The shape of the SF6 molecule is:

a) Square planar
b) Trigonal bipyramidal
c) Octahedral
d) Seesaw

Answer: c) Octahedral

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

95. Which of the following compounds is aromatic?

a) Cyclohexane
b) Benzene
c) Cyclopropane
d) Ethylene

Answer: b) Benzene

Explanation: Benzene (C6H6) is an aromatic compound because it has a conjugated pi-electron system and follows Huckel’s rule for aromaticity.

96. The bond order of N2 is:

a) 1
b) 2
c) 3
d) 4

Answer: c) 3

Explanation: The nitrogen molecule (N2) has a bond order of 3, meaning there is a triple bond between the two nitrogen atoms.

97. The correct IUPAC name of CH3CH2CH2CHO is:

a) Propanal
b) Butanal
c) Ethanal
d) Propanone

Answer: b) Butanal

Explanation: The compound has four carbon atoms with an aldehyde group (-CHO) at the end, making it butanal.

98. The shape of ClF3 is:

a) Trigonal planar
b) T-shaped
c) Square planar
d) Trigonal bipyramidal

Answer: b) T-shaped

Explanation: Chlorine trifluoride (ClF3) has a T-shaped geometry due to three bonding pairs and two lone pairs on the central chlorine atom.

99. Which of the following species has the same geometry as NH3?

a) H2O
b) CH4
c) PH3
d) BF3

Answer: c) PH3

Explanation: Phosphine (PH3) has a trigonal pyramidal geometry similar to that of ammonia (NH3) due to the presence of one lone pair and three bonding pairs on the central atom.

100. Which of the following has the shortest bond length?

a) HCl
b) HF
c) HI
d) HBr

Answer: b) HF

Explanation: HF has the shortest bond length due to the small size and high electronegativity of fluorine, leading to a stronger and shorter bond compared to other hydrogen halides.

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