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Chemistry Question on Chemical Reactions of Aldehydes Ketones and Carboxylic Acids

Given below are two statements one is labelled as Assertion A and the other is labelled as Reason R:

Assertion A: The amphoteric nature of water is explained by using Lewis acid/base concept

Reason R: Water acts as an acid with NH3 and as a base with H2S.

In the light of the above statements choose the correct answer from the options given below:

A

Both A and R are true and R is the correct explanation of A.

B

Both A and R are true but R is NOT the correct explanation of A.

C

A is true but R is false.

D

A is false but R is true.

Answer

Both A and R are true and R is the correct explanation of A.

Explanation

Solution

The correct option is(D): A is false but R is true.

The amphoteric nature of water is explained by using Bronsted-Lowry acid base concept

H2O(acid)+NH3⇋OH−+NH4+H_2O(acid)+NH_3⇋OH^-+NH_4^+

H2O(base)+H2S⇋H3O++HS−H_2O(base)+H_2S⇋H_3O^++HS^-

Hence, A is false but R is true.