Given below are two statements one is labelled as Assertion A and… - Vidyadip

MCQ

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 $NH _{3}$ and as a base with $H _{2} S$.

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.
✓
$A$ is false but $R$ is true.

✓

Answer

Correct option: D.

$A$ is false but $R$ is true.

d
$\underset{\text { Acid }}{ H _{2} S }+\underset{\text { Base }}{ H _{2} O } \rightleftharpoons H _{3} O ^{+}+ HS ^{-}$

$\underset{\text { Acid }}{ H _{2} O }+\underset{\text { Base }}{ NH _{3}} \rightleftharpoons NH _{4} OH$

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