Aqueous solutions of $H N O_{3}, K O H, C H_{3} C O O H$ and $C H_{3} C O O N a$ of identical concentrations are provided. The pair(s) of solutions which form a buffer upon mixing is/are

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$H N O_{3}$ and $C H_{3} C O O H$

$K O H$ and $C H_{3} C O O N a$

$H N O_{3}$ and $C H_{3} C O O N a$

$C H_{3} C O O H$ and $C H_{3} C O O N a$

answer is D.

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Detailed Solution

Only the choice (d) contains constituents which can combine with the small amounts of acid or base added to the solution.

$C H_{3} C O O H + O H^{-} \to C H_{3} C O O^{-} + H_{2} O$ ;

$C H_{3} C O O N a + H^{+} \to C H_{3} C O O H + N a^{+}$

Thus, the pH of solution will not be affected significantly.

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