Question

Assertion :An aqueous solution of $N{H}_{4}Cl$ changes blue litmus to red. Reason: $N{H}_3$ is a weak base, $HCl$ is a strong acid.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

$N{H}_{4}Cl\to N{H}_4^{+}+C{l}^{-}$
$N{H}_4^{+}+C{l}^{-}+H_{2}O=N{H}_{4}OH+H^{+}+C{l}^{-}$
$N{H}_4^{+}$ combines with $O{H}^{-}$ forming a weakly dissociated base whereas anion $C{l}^{-}$ does not combine with $H^{+}$( $HCl$ being a strong acid) as a result the solution is acidic.