Question

Assertion :Assertion : A solution of $N{H}_{4}Cl$ in water is acidic in nature. Reason: Reason : Ammoniun ions undergo hydrolysis to form $N{H}_{4}OH$.

• A. If both the assertion and reason are true and reason is the correct explanation of assertion.
• B. If both the assertion and reason are true but reason is not the correct explanation of assertion.
• C. If assertion is true but reason is false
• D. If both assertion and reason are false.

Answer 1

The correct option is A If both the assertion and reason are true and reason is the correct explanation of assertion.

$N{H}_{4}C{l}_{\left(aq\right)}\to N{H}_{4\left(aq\right)}^{+}+C{l}_{\left(aq\right)}^{-}$
$N{H}_4^{+}$ ions formed, undergo hydrolysis with water to form $N{H}_{4}OH$ and $H^{+}$ ions. $N{H}_{4}OH$ is a weak base and thus remains almost unionised in solution. As a result, $\left[H^{+}\right]$ ions increase in solution, making the solution acidic.