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Aqueous solution of HNO(3), KOH, CH(3)CO...

Aqueous solution of `HNO_(3), KOH, CH_(3)COOH and CH_(3)COONa` of identical concentration are provided. The pair (s) of solutions which form a buffer upon mixing is (are)

A

`HNO_3` and `CH_3COOH`

B

`KOH` and `CH_3COONa`

C

`HNO_3` and `CH_3COONa`

D

`CH_3COOH` and `CH_3COONa`

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The correct Answer is:
C, D
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