The total number of diprotic acids among the following is:
$H_3PO_4, H_2SO_4, H_3PO_3, H_2CO_3, H_2S_2O_7, H_3BO_3, H_3PO_2, H_2CrO_4, H_2SO_3$

The conjugate base of ${(CH_3)_2}\mathop N\limits^ + {H_2}$ is:

$HSO_4^-$ is the conjugate base of

Three reactions involving $H_2PO_4^-$ are given below :
$(i) \; H_3PO_4 + H_2O \rightarrow H_3O^{+} + H_2PO_4^-$
$(ii) \; H_2PO_4^- + H_2O \rightarrow HPO_4^{2-} + H_3O^{+}$
$(iii) \; H_2PO_4^- + OH^{-} \rightarrow H_2O + HPO_4^{2-}$
In which of the above does $H_2PO_4^-$ act as an acid?

Which one of the following can be classified as a Bronsted base?

Conjugate acid and conjugate base of $HCO_3^{-}$ are respectively