Question

Assertion: An aqueous solution of ammonium acetate can act as a buffer.

Reason: Acetic acid is a weak acid and $N{H}_{4}OH$ is a weak base.

• 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 1

The correct option is C

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

Analyzing the Assertion and Reason:

Assertion :

It is true because solution of ammonium acetate is salt solution giving $N{H}_4^{+}$ and $C{H}_{3}CO{O}^{-}$ ions which can react with both $H^{+}$ and $O{H}^{-}$ from strong acid or base in a small amount to form weak acid or base so will resist the change in $pH,$ so it is a buffer solution.

Reason :

It is not because $C{H}_{3}COOH$ is weak acid and $N{H}_{4}OH$ is a weak base as explained above.

$\therefore$ Correct option is $\left(iii\right).$