The dissociation constant of a weak monobasic acid is $3.2 \times 10^{-4}$. Calculate the degree of dissociation in its 0.04 M solution.

The solubility of $\mathrm{CaCO}_3$ is $7 \times 10^{-5} \mathrm{~mol} \mathrm{dm}^{-3}$ at $25^{\circ} \mathrm{C}$. What is its solubility product at same temperature?

Which among the following is the conjugate base of $\mathrm{HClO}_4$ ?

What is pH of a centimolar solution of $\mathrm{H}_2 \mathrm{SO}_4$ ?