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

Options

A. `H_(2)CO_(3) //HCO_(3)^(-)`
B. `NH_(4)OH//NH_(4)Cl`
C. `CH_(3)COOH//CH_(3)COO_(-)`
D. `CH_(3)COONH_(4)`

Answer

A

Explanation

`H_(2)CO_(3)` being a weak acid, dissociates as follows,
`H_(2)CO_(3)+H_(2)O hArr HNO_(3)^(-)+H_(3)O^(+)`
`HCO_(3)^(-) hArr CO_(3)^(2-)+H_(3)O^(+)`
`therefore ` The `H_(3)CO_(3)//HCO_(3)^(-)` system acts as buffer and helps in maintaining blood pH.