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Which of the following pairs constitutes buffer ?

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HCl and KCl

${HNO}_{2} and {NaNO}_{2}$

NaOH and NaCl

${HNO}_{3} and {NH}_{4} {NO}_{3}$

answer is C.

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Detailed Solution

The mixture containing a weak acid $({HNO}_{2})$ and its conjugate base $({NO}_{2}^{-})$ acts as acidic buffer.

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