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Lone Pairs and Bond Pairs

Assertion: Th...

Question

Assertion: Through the central atom of both ${NH}_{3} and H_{2} O$ molecules are ${sp}^{3}$ hybridised, yet the $H - N - H$ bond angle is greater than that of $H - O - H .$
Reason: This is because the nitrogen atom has a lone pair and the oxygen atom has two lone pairs.

The assertion is true, but the Reason is false.

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Both Assertion and Reason are false.

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Both Assertion and Reason are true. The Reason is the correct explanation for Assertion.

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Both Assertion and Reason are true. The Reason is not the correct explanation for Assertion.

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Solution

The correct option is C
Both Assertion and Reason are true. The Reason is the correct explanation for Assertion.

Explanation for correct option:
(C) Both Assertion and Reason are true. The Reason is the correct explanation for Assertion.
The electron pair that takes part in the bond formation is called bond pair and the electron pair that does not take part in bond formation is called a lone pair.
There is always some repulsion between the lone pair and bond pair.
If the lone pair and bond pair are closer, there is maximum repulsion and the bond angle gets increased.
Likewise in the case of nitrogen, it is having three bonds pair and one lone pair but in water, there are two bond pairs and two lone pairs. So, the $H - N - H$ bond angle is greater than that of $H - O - H .$ So, this is the correct option.

Hence, the correct option is (C) Both Assertion and Reason are true. The Reason is the correct explanation for Assertion.

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Similar questions

Question 37

In both water and dimethyl ether $(C H_{3} - . . O . . - C H_{3})$ , oxygen atom is central atom, and has the same hybridisation, yet they have different bond angles. Which one has greater bond angle? Give reason.

Assertion (A): Though the central atom of both

{N H}_{3}

and

H_{2} O

molecules are

{s p}^{3} C

hybridized,

yet H-N-H bond angle is greater than that of H-O-H.

Reason (R): This is because nitrogen atom has a lone pair and oxygen atom has two lone pairs.

Q. In the following question a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below.

Assertion(A): Though the central atom of both

N H_{3} and H_{2} O

molecules are

s p^{3}

hybridised, yet

H - N - H

bond angle is greater than that of

H - O - H

.

Reason(R): This is because the nitrogen atom has one lone pair and oxygen atom has two lone pairs.

Consider the below-given reaction. The percentage yield of an amide product is ______. (Round off to the Nearest Integer).

[Given: Atomic mass: $C$ $= 12.0 u$ , $H$ $= 1.0 u$ , $N$ $= 14.0 u$ , $O$ $= 16.0 u$ , $Cl$ $= 35.5 u$ ]

Q. Assertion (A):

{NH}_{3}

and

H_{2} O

molecules are

{sp}^{3}

hybridised, but the bond angle of

{NH}_{3}

is more than that of

H_{2} O

.

Reason (R): Nitrogen atom has one lone pair whereas oxygen atom has two lone pairs of electrons.

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Assertion: Through the central atom of both NH3andH2O molecules are sp3hybridised, yet the H-N-H bond angle is greater than that of H-O-H.Reason: This is because the nitrogen atom has a lone pair and the oxygen atom has two lone pairs.

Assertion: Through the central atom of both ${NH}_{3} and H_{2} O$ molecules are ${sp}^{3}$ hybridised, yet the $H - N - H$ bond angle is greater than that of $H - O - H .$
Reason: This is because the nitrogen atom has a lone pair and the oxygen atom has two lone pairs.