An acidic buffer contains

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Excess of H⁺ ions, few anions and excess of undissociated molecules of weak acid

Excess of cations, few OH^- ions and some undissociated molecules of weak acid.

Excess of anions, few H⁺ ions and some undissociated molecules of weak acid

Strong acid and its salt with a weak base

answer is C.

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Detailed Solution

$mathop {C{H_3}COOH}limits_{a - x} ,,,,,, rightleftharpoons ,,,,mathop {C{H_3}CO{O^ - }}limits_{x + s} + mathop {{H^ + }}limits_x$

$mathop {C{H_3}COONa}limits_{s - s} ,,,,,, rightleftharpoons ,,,,mathop {C{H_3}CO{O^ - }}limits_{s + x} + mathop {{H^ + }}limits_s$

${K_a} = frac{{left (x + s right ) + left[ {{H^ + }} right]}}{{left (a - x right )}} Rightarrow left[ {{H^ + }} right] = {K_a}frac{{left( {acid} right)}}{{left (salt right )}};mathop {neglecting}limits_x$ .

${K_a} = frac{{left (x + s right ) + left[ {{H^ + }} right]}}{{left (a - x right )}} Rightarrow {P^H} = {P^{{K_a}}} + log frac{{left[ {salt} right]}}{{left[ {acid} right]}}$