Consider the following statements (a) The pH of a mixture containing 400 mL of 0.1 $\mathrm{M} \mathrm{H}_2 \mathrm{SO}_4$ and 400 mL of 0.1 M NaOH will be approximately 1.3. (b) Ionic product of water is temperature dependent. (c) A monobasic acid with $\mathrm{K}_{\mathrm{a}}=10^{-6}$ has a $\mathrm{pH}=5$. The degree of dissociation of this acid is 50\%. (d) The Le Chatelier's principle is not applicable to common-ion effect. The correct statements are.