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H(2)CO(3)+NaHCO(3) found in blood helps ...

`H_(2)CO_(3)+NaHCO_(3)` found in blood helps in maintaining pH of the blood close to 7.4. An excess of acid entering the blood stream is removed by:

A

`HCO_(3)^(-)`

B

`H_(2)CO_(3)`

C

`H^(+)` ion

D

`CO_(3)^(2-)` ion

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