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What % of the carbon in the H(2)CO(3)-HC...

What `%` of the carbon in the `H_(2)CO_(3)-HCO_(3)^(-)` buffer should be in the form of `HCO_(3)^(-)` so as to have a neutral solution? `(K_(a)=4xx10^(-7))`

A

`20%`

B

`40%`

C

`60%`

D

`80%`

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The correct Answer is:
d
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