The buffer system which helps to maintain the pH of blood between 7.26 to 7.42, is

Options

A. `H_(2)CO_(3)//HOO_(3)^(-_`
B. `NH_(4)OH//NH_(4)CI`
C. `CH_(3)COOH//CH_(3)COO^(-)`
D. `CH_(3)COONH_(4)`

Explanation

`H_(2)CO_(3)` is a weak dibasic acid and dissociates in following two steps :
`H_(2)CO_(3)(aq)+H_(2)O(I)rarrHCO_(3)^(-)(aq)+H_(3)O^(+)(aq)`
`HCO_(3)^(-)(aq)+H_(2)O(I)rarrCO_(3)^(2-)(aq)+H_(3)O^(+)(aq)`
`H_(2)CO_(3)//HCO_(3)^(-)` buffer system helps to maintain pH of blood between 7.26 to 7.42.