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Question

Aqueous solutions of HNO3,KOH,CH3COOH and CH3COONa of identical concentrations are provided. The pair(s) of solutions which form a buffer upon mixing are:

A
HNO3 and CH3COOH
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B
KOH and CH3COONa
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C
HNO3 and CH3COONa
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D
CH3COOH and CH3COONa
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Solution

The correct options are
C HNO3 and CH3COONa
D CH3COOH and CH3COONa
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.
CH3COONa+HNO3CH3COOH+NaNO3
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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