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CBSE

NEET Chemistry : Chemical Bonding and Molecular Structure

Multiple Choice Questions

111.

Each NH₃ molecule has six other NH₃ molecules as nearest neighbours in solid state ; $∆$ H of sublimation of NH₃ molecule at the m.p. is 30.8 kJ mol^-1 and in the absence of H-bonding estimated Ml of sublimation is 14.4 kJ mol^-1 .Hence , strength of H-bond in solid NH₃ is :

5.47 kJ mol^-1
10.93 kJ mol^-1
16.40 kJ mol^-1
- 16.40 kJ mol^-1

112.

N₂O is isoelectronic to CO₂ and $N_{3}^{-}$ . Which of the following is the structure of N₂O ?

N-O-N
N-N-O

113.

Which of the following molecules has more than one lone pair ?

SO₂
XeF₂
SiF₄
CH₄

114.

Four diatomic species are listed below in different sequences. Which of these represents the correct order of their increasing bond order?

$C_{2}^{2 -}$ < ${He}_{2}^{+}$ < NO < $O_{2}^{-}$
${He}_{2}^{+}$ < $O_{2}^{-}$ < NO < $C_{2}^{2 -}$
$O_{2}^{-}$ < NO < $C_{2}^{2 -}$ < ${He}_{2}^{+}$
NO < $C_{2}^{2 -}$ < $O_{2}^{-}$ < ${He}_{2}^{+}$

115.

Hydride of boron occurs as B₂H₆ but B₂Cl₆ does not exist. This is because

p $π$ - d $π$ back bonding is possible in B₂H₆ but not in B₂Cl₆
boron and hydrogen have almost equal values of electronegativity
boron and chlorine have almost equal atomic sizes
small hydrogen atoms can easily fit in between boron atoms but large chlorine atoms do not.

116.

Assertion: Both $π$ (2p_x) and $π$ ^*(2p_x) MO's have one nodal plane.

Reason : All MO's formed by side way overlapping of 2p- orbitals have one nodal plane.

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false.

117.

Assertion : [Fe(CN)₆]^3- has d²sp³ type hybridisation.

Reason: [Fe(CN)₆]^3- ion shows magnetic moment corresponding to two unpaired electrons.

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false
If both assertion and reason are false.

118.

Assertion : trans-Pent-2-ene is polar but trans- but-2-ene is non-polar.

Reason : The polarity of cis-isomer is more than trans-isomer, which are either non-polar or less polar.

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false

119.

Which one ofthe following is not tetrahedral in shape ?

SiCl₄
N $H_{4}^{+}$
CH₄
SF₄

120.

Assertion : The number of tetrahedral voids is double the number of octahedral voids.

Reason : The size of the tetrahedral voids is half of that of the octahedral void.

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.

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Subject

NEET Chemistry : Chemical Bonding and Molecular Structure

Multiple Choice Questions