Which one of the following is the correct statement?

Options

A. `HCO_(3)^(-)` is the conjugate base of `CO_(3)^(2-)`
B. `NH_(2)^(-)` is the conjugate acid of `NH_(3)`
C. `H_(2)SO_(4)` is the conjugate acid of `HSO_(4)^(-)`
D. `NH_(3)` is the conjugate base of `NH_(2)^(-)`

Answer

C

Explanation

Acid when loses a proton `(H^(+))` gives its conjugate base and base when accepts a proton `(H^(+))`, gives its conjugate acid.
(a) `underset("base")(CO_(3)^(2-))+H^(+)rarrunderset("conjugate acid")(HCO_(3)^(-))`
(b) `underset("acid")(NH_(3))rarrunderset("conjugate base")(NH_(2)^(-))+H^(+)`
(c ) `underset("base")(HSO_(4)^(-))+H^(+)rarrunderset("conjugate acid")(H_(2)SO_(4))`
(d) `underset("base")(NH_(2)^(-))+H^(+)rarrunderset("conjugate acid")(NH_(3))`
(e) `underset("base")(HCO_(3)^(-))+H^(+)rarrunderset("conjugate acid")(H_(2)CO_(3))`