In aqueous solution, the following mixture acts as buffer :

H N O_{3} + K N O_{3}

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H_{2} S O_{4} + K_{2} S O_{4}

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N H_{4} O H + N H_{4} C l

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C H_{3} C O O H + N a C l

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Solution

The correct option is C $N H_{4} O H + N H_{4} C l$
For buffer solution
Weak acid + Its salt of strong base
OR Weak base + Its salt of strong acid.
In Option C
$N H_{4} O H \to$ weak base
$N H_{4} C l \to$ weak base and strong acid salt
Thus option C is right. While no other option follow definition of buffer solution.

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N H_{4} C l

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N a_{2} C O_{3}

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