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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-3>Q 18

Among the following, the molecule with highest dipole moment is ?

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Alpha Question Bank for Engineering: Chemistry>Chapter 14 - Chemical Bonding and Molecular Structure>Exercise-3>Q 19

Which of the following statements is true?

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

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

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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, ${\mathrm{O}}^{2-}\left(\mathrm{g}\right)$ , from oxygen atom requires first an exothermic and then an endothermic step as shown in below:

$\mathrm{O}\left(\mathrm{g}\right)+{\mathrm{e}}^{-}⟶{\mathrm{O}}^{-}\left(\mathrm{g}\right)\mathrm{ }\mathrm{ }\mathrm{ };\mathrm{ }\mathrm{ }{\mathrm{\Delta }}_{\mathrm{f}}{\mathrm{H}}^{\ominus }=-141\mathrm{ }\mathrm{k}\mathrm{J}\mathrm{ }\mathrm{m}\mathrm{o}{\mathrm{l}}^{-1}$

${\mathrm{O}}^{-}\left(\mathrm{g}\right)+{\mathrm{e}}^{-}⟶{\mathrm{O}}^{2-}\mathrm{ }\left(\mathrm{g}\right)\mathrm{ };\mathrm{ }\mathrm{ }{\mathrm{\Delta }}_{\mathrm{f}}{\mathrm{H}}^{\ominus }=+780\mathrm{ }\mathrm{k}\mathrm{J}\mathrm{ }\mathrm{m}\mathrm{o}{\mathrm{l}}^{-1}$

Thus process of formation of ${\mathrm{O}}^{2-}$ in gas phase is unfavourable though ${\mathrm{O}}^{2-}$ 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 $\mathrm{X}$ 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 ${\mathrm{BF}}_3$, the $\mathrm{B}-\mathrm{F}$ bond length is $1.30 \stackrel{\mathrm{o}}{\mathrm{A}}$, when ${\mathrm{BF}}_3$ is allowed to be treated with ${\mathrm{Me}}_3\mathrm{N}$, it forms an adduct, ${\mathrm{Me}}_3\mathrm{N}\to {\mathrm{BF}}_3$, The bond length of $\mathrm{B}-\mathrm{F}$ 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 ${\mathrm{Al}}_2{\mathrm{Cl}}_6$ 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: