The conjugate base of $NH_3$ is:

The dissociation constant of a weak acid is $1.0 \times 10^{-5}$. The equilibrium constant for its reaction with a strong base is:

The first and second dissociation constants of an acid $H_2A$ are $1.0 \times 10^{-5}$ and $5.0 \times 10^{-10}$ respectively. The overall dissociation constant of the acid will be

According to the Lewis concept,an acid is a substance which

Urea is preferred to ammonium sulphate as a nitrogenous fertilizer because

Which among the following is the strongest acid?