49. Assertion (A) An aqueous solution of ammonium acetate can act as a buffer.

Reason (R) Acetic acid is a weak acid and ${\mathrm{NH}}_{4}\mathrm{OH}$ 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) Both A and R are false

(b) Both assertion and reason are true but reason is not correct explanation of assertion.
Ammonium acetate is a salt of weak acid $\left({\mathrm{CH}}_{3}\mathrm{COOH}\right)$ and weak base $\left({\mathrm{NH}}_{4}\mathrm{OH}\right)$