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The first and second dissociation consta...

The first and second dissociation constants of an acid `H_(2)A` are `10^(-5)` and `5 xx 10^(-10)` respectively . Then overall dissociation constant of the acid is

A

`5 xx 10^(15)`

B

`5 xx 10^(-15)`

C

`2 xx 10^(5)`

D

`5 xx 10^(-5)`

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The correct Answer is:
B
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