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A buffer solution contains 0.04 M HA and...

A buffer solution contains `0.04 M HA` and `0.01 M CaA_(2)`. If `K_(b)` of `A^(-)` is `10^(-12)` then pH of buffer solution is
Given : `log 2 = 0.3`

A

1.397

B

2.5

C

2.8

D

4

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ALLEN-TEST PAPERS-part-2 Chemistry
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