Alpha Question Bank for Engineering: Chemistry>Chapter 14 - Chemical Bonding and Molecular Structure>Exercise-3>Q 20

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Which one of the following pairs of molecules will have permanent dipole moments for both members?

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Important Questions on Chemical Bonding and Molecular Structure

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Alpha Question Bank for Engineering: Chemistry>Chapter 14 - Chemical Bonding and Molecular Structure>Exercise-4>Q 1

The formation of the oxide ion,

O^{2 -} (g)

, from oxygen atom requires first an exothermic and then an endothermic step as shown in below:

O (g) + e^{-} ⟶ O^{-} (g); Δ_{f} H^{⊖} = - 141 k J m o l^{- 1}

O^{-} (g) + e^{-} ⟶ O^{2 -} (g); Δ_{f} H^{⊖} = + 780 k J m o l^{- 1}

Thus process of formation of

O^{2 -}

in gas phase is unfavourable though

O^{2 -}

is isoelectronic with neon. It is due to the fact that,

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Alpha Question Bank for Engineering: Chemistry>Chapter 14 - Chemical Bonding and Molecular Structure>Exercise-4>Q 2

Formation of anion from a neutral atom

X

is favoured by

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Alpha Question Bank for Engineering: Chemistry>Chapter 14 - Chemical Bonding and Molecular Structure>Exercise-4>Q 3

In

{BF}_{3}

, the

B - F

bond length is

1.30 \overset{o}{A}

, when

{BF}_{3}

is allowed to be treated with

{Me}_{3} N

, it forms an adduct,

{Me}_{3} N \to {BF}_{3}

, The bond length of

B - F

in the adduct is :

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Alpha Question Bank for Engineering: Chemistry>Chapter 14 - Chemical Bonding and Molecular Structure>Exercise-4>Q 4

The change in hybridization of aluminium when

{Al}_{2} {Cl}_{6}

decomposes in the gas phase is :

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Alpha Question Bank for Engineering: Chemistry>Chapter 14 - Chemical Bonding and Molecular Structure>Exercise-4>Q 5

The hybridisation of carbon atoms present in the smallest ester are:

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Alpha Question Bank for Engineering: Chemistry>Chapter 14 - Chemical Bonding and Molecular Structure>Exercise-4>Q 6

In the following conversion,

{CH}_{3} {CH}_{2} C \equiv N \to {CH}_{3} {CH}_{2} - {CH}_{2} - {NHCOCH}_{3}

, the nitrogen atom changes its state of hybridisation from

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Alpha Question Bank for Engineering: Chemistry>Chapter 14 - Chemical Bonding and Molecular Structure>Exercise-4>Q 7

Which one of the following has highest dipole moment?

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Alpha Question Bank for Engineering: Chemistry>Chapter 14 - Chemical Bonding and Molecular Structure>Exercise-4>Q 8

The correct order of dipole moment for the following molecules is:

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