JEE Advanced 2010 Chemistry question

Aqueous solutions of , KOH, , and of identical concentrations are provided. The pair(s) of solutions which form a buffer upon mixing is(are)

(A) and
(B)KOH and
(C) and Correct
(D) and Correct

Answer: (C),(D)

Solution

An acidic buffer must contain a weak acid together with its conjugate base (salt) in comparable amounts. (D) + is directly a weak acid/conjugate base pair, so it is a buffer. (C) reacts completely with acetate: .

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Question ID VK-025746