Aqueous solutions of $\mathrm{HNO}_{3}, \mathrm{KOH}, \mathrm{CH}_{3} \mathrm{COOH}$ and $\mathrm{CH

Question

Aqueous solutions of $\mathrm{HNO}_{3}, \mathrm{KOH}, \mathrm{CH}_{3} \mathrm{COOH}$ and $\mathrm{CH}_{3} \mathrm{COONa}$ of identical concentrations are provided. The pair(s) of solutions which form a buffer upon mixing is(are)\

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(d) : Buffer solution is one, where pH is not altered to any great extent by the addition of small quantities of either an acid or a base. Buffer solutions can be obtained by mixing :\ (i) a weak acid with its salt with a strong base\ (ii) a weak base with its salt with a strong acid.\ Thus, option (d) $\mathrm{CH}_{3} \mathrm{COOH}$ and $\mathrm{CH}_{3} \mathrm{COONa}$ is the only buffer solution among the given options.\