Q. 58

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 each question.

Assertion (A) : Though the central atom of both NH3 and H2O molecules are sp3 hybridised, yet H–N–H bond angle is greater than that of H–O–H.

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

(i) A and R both are correct, and R is the correct explanation of A.

(ii) A and R both are correct, but R is not the correct explanation of A.

(iii) A is true but R is false.

(iv) A and R both are false.

Answer :

(i);

The central atom of both NH3 and H2O molecules are sp3 hybridized, yet H–N–H bond angle is greater than that of H–O–H. This is because the nitrogen atom has one lone pair and the oxygen atom has two lone pairs. The lone pair and bond pair repulsion is greater in the ammonia as compared to water.


Thus, both the assertion and the reason are correct and the reason is the correct explanation of the assertion.


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