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

Aqueous solution of `HNO_(3),CH_(3),CH_(3)COOH`, and `CH_(3)COOK` of identical concentrations are given. The pair (s) of the solution which may form a buffer upon mixing is (are):

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The correct Answer is:
CD

In `HNO_(3)`and `CH_(3)COONa`combination, if `HNO_(3)`is present in limiting amount, it will be neutralized completely, leaving behind some excess of `CH_(3)COONa`
`CH_(3)COONa + HNO_(3) rarr CH_(3)COOH + NaNO_(3)`
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