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Chemical Bonding and Atomic Structure MCQs for NEET — Chemistry Questions with Answers

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The hybridization of carbon atoms in C-C single bond of $C \equiv C - C H = C H_{2}$ is-

$s p^{3} - s p^{3}$

$s p^{2} - s p$

$s p - s p$

$s p^{3} - s p$

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Explanation

As the first carbon has triple bond and second one has double bond with other two carbon atom.

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C-C bond in C₂H₆ undergoes heterolytic fission, the hybridisation of carbon is/are-

$s p^{2}$

$s p^{3}$

$s p^{2}, s p^{3}$

$s p, s p^{2}$

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Explanation

During heterolytic fission there will be formation of CH₃⁺ and CH₃^- which has sp² and sp³ hybridization respectively.

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The enolic form of acetone contains how many $σ$ bonds (a), $π$ bonds (b) and lone pairs (c)-

9a, 1b, 2c

8a, 2b, 2c

10a, 1b, 1c

9a, 2b, 1c

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Assertion : The $O - O$ bond length of $H_{2} O_{2}$ is shorter than that of $O_{2} F_{2} .$

Reason : $H_{2} O_{2}$ is an ionic compound.

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion C. If the assertion is true but the reason is false D. If both the assertion and reason are false

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Explanation

(D). The lone pairs of electrons on the O atoms are strongly attracted by the electronegative F

atoms. As a result, lone pair-lone pair repulsion of the two oxygen atoms is far less in $O_{2} F_{2}$

than in $H_{2} O_{2}$ . As a result, $O - O$ bond length is $O_{2} F_{2}$ (1.22 $\overset{\circ}{A}$ ) is much shorter than in

$H_{2} O_{2}$ (1.48 $\overset{\circ}{A}$ )

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Among $C a H_{2}, N H_{3}, N a H a n d B_{2} H_{6}$ , which are covalent hydride?

$N H_{3} a n d B_{2} H_{6}$

$C a H_{2} a n d B_{2} H_{6}$

$N a H a n d C a H_{2}$

$N a H a n d N H_{3}$

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Atomic hydrogen produces formaldehyde when it reacts with:

$C O_{2}$

$O_{2}$

$C_{2} H_{2}$

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Which of the following is soluble in pyridine:-

LiCl

CsCl

NaCl

KCl

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Explanation

LiCl is covalent so can get dissolve in organic solvent

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Lattice energy is lowest for –

LiF

NaCl

KBr

CsI

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Explanation

(D). Due to large size of Cs and I atoms.

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Which of the following halides has the highest melting point-

NaCl

KCl

NaBr

NaF

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Explanation

(D). Apply Fazan’s rule.

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Which of the following statement is false regarding saline hydrides –

They conduct electricity in molten state

They dissolve in water and liberate $H_{2}$

They are used as reducing agents

They are covalent in nature

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Explanation

(D). They are not covalent, but ionic in nature.

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