1.

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

Answer»

`HNO_(3)` and `CH_(3)COOH`
KOH and `CH_(3)COONa`
`HNO_(3)` and `CH_(3)COONa`
`CH_(3)COOH` and `CH_(3)COONa`

SOLUTION :`HNO_(3) + CH_(3)COONa` mixture can ACT as buffer solutions if volume of `HNO_(3)` solution taken is LESSER than volume of `CH_(3)COONa` solution because of following reaction
`CH_(3)COONa+HNO_(3)RARR CH_(3)COOH + NaNO_(3)`
(d) `CH_(3)COOH + CH_(3)COONa`-mixture will act as buffer.


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