JEE Main 2019 — Ionic Equilibrium Question with Solution

Consider the following statements
$\left(\mathrm{a}\right)$ The pH of a mixture containing $400\mathrm{ }\mathrm{m}\mathrm{L}$ of $0.1\mathrm{ }\mathrm{M}\mathrm{ }{\mathrm{H}}_2\mathrm{S}{\mathrm{O}}_4$ and $400\mathrm{ }\mathrm{m}\mathrm{L}$ of $0.1\mathrm{ }\mathrm{M}\mathrm{ }\mathrm{N}\mathrm{a}\mathrm{O}\mathrm{H}$ will be approximately $1.3.$
$\left(\mathrm{b}\right)$ Ionic product of water is temperature dependent.
$\left(\mathrm{c}\right)$ A monobasic acid with ${\mathrm{K}}_{\mathrm{a}}={10}^{-5}$ has a $\mathrm{p}\mathrm{H}=5$ . The degree of dissociation of this acid is $50\mathrm{\%}$ .
$\left(\mathrm{d}\right)$ The Le Chatelier's principle is not applicable to common-ion effect.
The correct statements are: