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Successive dissociation constants of H(2...

Successive dissociation constants of `H_(2)CO_(3)` are `K_(a_(1)) = 10^(-3)` and `K_(a_(2)) = 10^(-6)`. An aqueous solution contains `0.1 MH_(2)CO_(3)` and `0.1 M HCI` at `25^(@)C`
If solution contains only `0.1 M H_(2)CO_(3)` then the concentration of `CO_(3)^(2-)` at equilibrium in the solution will be :

A

`10^(-6) M`

B

`10^(-12)M`

C

`10^(-9)M`

D

`10^(-12)M`

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The correct Answer is:
a
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