Which of the following systems helps to maintain the `pH` of blood?

Options

A. `CO_(2)(aq.)//H_(2)CO_(3)(aq.)`
B. `H_(2)CO_(3)(aq.)//HCO_(3)^(-)(aq.)`
C. `HCO_(3)^(-)(aq.)//CO_(3)^(2-)(aq.)`
D. `H_(2)CO_(3)(aq.)//CO_(3)^(2-)(aq.)`

Answer

B

Explanation

`H_(2)CO_(3)//HCO_(3)^(-)` buffer system helps to maintain the `pH` of blood between `7.26` to `7.42`.