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A solution containing 0.1" mole" //L HN(...

A solution containing `0.1" mole" //L HN_(3)` and `0.2 " mol "//L NaN_(3)` has a pH =4.8. The `K_(a)` of `HN_(3)` is :

A

`2xx10^(-4)`

B

`4xx10^(-2)`

C

`5xx10^(-3)`

D

`3xx10^(-5)`

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The correct Answer is:
d
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