Assertion (A) : The amphoteric nature of water is explained by using Lewis acid/base concept.
Reason (R) : Water acts as an acid with ${NH}_{3}$ and as a base with $H_{2} S$ .
choose the correct answer from the options given below :

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

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

A is false but R is true.

A is true but R is false.

answer is D.

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Detailed Solution

$H_{2} S + H_{2} O ⇌ H_{3} O^{+} + {HS}^{-} water acts as base$

$H_{2} O + {NH}_{3} ⇌ {NH}_{4} OH water acts as acid$

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