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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: 492

Chemistry MCQ with Answer Explanation : Coordination compounds.

81. Which of the following species is isoelectronic with CO2?

a) NO2
b) N2O
c) O2
d) H2O

Answer: b) N2O

Explanation: Nitrous oxide (N2O) is isoelectronic with carbon dioxide (CO2) because both have the same number of valence electrons and a similar linear structure.

82. Which of the following molecules has the smallest bond angle?

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

Answer: a) H2O

Explanation: Water (H2O) has the smallest bond angle of approximately 104.5° due to the repulsion between the two lone pairs on the oxygen atom.

83. The hybridization of carbon in diamond is:

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

Answer: c) sp3

Explanation: In diamond, each carbon atom is sp3 hybridized, forming four sigma bonds in a tetrahedral structure.

84. The correct IUPAC name for CH3CH2COOCH3 is:

a) Methyl propanoate
b) Ethyl acetate
c) Methyl butanoate
d) Ethyl propanoate

Answer: a) Methyl propanoate

Explanation: The ester has a three-carbon chain derived from propanoic acid (propanoate) and a methyl group (-OCH3). Therefore, the correct IUPAC name is methyl propanoate.

85. Which of the following molecules has a distorted tetrahedral geometry (seesaw)?

a) SF4
b) XeF4
c) IF5
d) CH4

Answer: a) SF4

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

86. The bond order of O2 is:

a) 1
b) 2
c) 3
d) 1.5

Answer: b) 2

Explanation: Molecular oxygen (O2) has a bond order of 2, indicating a double bond between the two oxygen atoms.

87. Which of the following compounds contains both ionic and covalent bonds?

a) NaCl
b) H2O
c) NaOH
d) CH4

Answer: c) NaOH

Explanation: Sodium hydroxide (NaOH) contains an ionic bond between Na+ and OH- and a covalent bond within the hydroxyl group (O-H).

88. Which of the following compounds is planar?

a) CH4
b) C2H6
c) C2H4
d) NH3

Answer: c) C2H4

Explanation: Ethene (C2H4) is planar due to sp2 hybridization of the carbon atoms, which results in a flat, trigonal planar structure.

89. The number of sigma and pi bonds in acetylene (C2H2) is:

a) 3 sigma, 2 pi
b) 4 sigma, 1 pi
c) 2 sigma, 2 pi
d) 3 sigma, 1 pi

Answer: a) 3 sigma, 2 pi

Explanation: In acetylene (C2H2), there are 3 sigma bonds (one between the two carbon atoms and two between the carbon atoms and hydrogen atoms) and 2 pi bonds in the carbon-carbon triple bond.

90. Which of the following species is paramagnetic?

a) O2
b) N2
c) F2
d) CO

Answer: a) O2

Explanation: Molecular oxygen (O2) is paramagnetic because it has unpaired electrons in its molecular orbitals, as predicted by molecular orbital theory.

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