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 are:

H N O_{3}

and

C H_{3} C O O H

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KOH and

C H_{3} C O O N a

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H N O_{3}

and

C H_{3} C O O N a

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C H_{3} C O O H

and

C H_{3} C O O N a

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Solution

The correct options are
C $H N O_{3}$ and $C H_{3} C O O N a$
D $C H_{3} C O O H$ and $C H_{3} C O O N a$
A buffer solution consists of weak acid and its salt with strong base or weak base and its salt with strong acid.
(C) If nitric acid is the limiting reagent, then it will partially convert sodium acetate to acetic acid.
$C H_{3} C O O N a + H N O_{3} \to C H_{3} C O O H + N a N O_{3}$
Now the solution contains acetic acid (weak acid) and sodium acetate (salt with strong base NaOH). Hence, it is a buffer solution.
(D) Acetic acid (weak acid) and sodium acetate (salt with strong base NaOH) form a buffer solution.

Thus, the options (C) and (D) form buffer solutions.

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