Note: In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.
Assertion (A): An aqueous solution of ammonium acetate can act as a buffer.
Reason (R) : Acetic acid is a weak acid and NH4OH is a weak base.
A buffer is a solution containing either a weak acid and its salt or a weak base and its salt, which is resistant to pH change.
The aqueous solution of ammonium acetate is a salt of weak acid (acetic acid) and weak base (NH4OH).
Therefore, weak acid (CH3COOH) and its salt (CH3COONH4) constitute a buffer.