Baking soda is

The conjugate bases for $HCO_3^-$ and $NH_3$,respectively,are

The number of species among the following that can act both as Bronsted acids and bases is $HCl, ClO_4^{-}, OH^{-}, H^{+}, H_2O, HSO_4^{-}, SO_4^{2-}, H_2SO_4, Cl^{-}$.

$HCO_3^-$ is a conjugate acid of :-

When $K_2O$ is added to water,the solution becomes basic in nature because it contains a significant concentration of

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