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)

H N O_{3} a n d C H_{3} C O O H

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K O H a n d C H_{3} C O O N a

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H N O_{3} a n d C H_{3} C O O N a

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C H_{3} C O O H a n d C H_{3} C O O N a

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Solution

The correct option is D $C H_{3} C O O H a n d C H_{3} C O O N a$
In $H N O_{3}$ and $C H_{3} C O O N a$ combination, if $H N O_{3}$ is present in limiting amount, it will be neutralised completely, leaving behind some excess of $C H_{3} C O O N a .$

$C H_{3} C O O N a + H N O_{3} \to C H_{3} C O O H + N a N O_{3} B u f f e r c o m b i n a t i o n$

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