Consider the following statements \((a)\) The \(pH\) of a mixture containing \(400\, mL\) of \(0.1\, M\, H_2SO_4\) 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 \(K_a = 10^{-5}\) has a \(pH = 5\). 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:

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.