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Q.

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

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a

CH3COOH  and  CH3COONa

b

HNO3  and  CH3COOH

c

HNO3  and  CH3COONa

d

KOH  and  CH3COONa

answer is C, D.

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Detailed Solution

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HNO3+CH3COO can act as buffer solution HNO3 neutralizes OH &CH3COO  neutralizes H+ furnished by any acid or base.
CH3COOH and CH3COONa can act as buffer solution since it contoins weak acid it salt  with strong base. 

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