MHT CET · Chemistry · Ionic Equilibrium

Which among the following salts turns red litmus blue in its aqueous solution?

A \(\mathrm{Na}_2 \mathrm{SO}_4\)
B \(\mathrm{CH}_3 \mathrm{COONa}\)
C \(\mathrm{NH}_4 \mathrm{NO}_3\)
D \(\mathrm{CuCl}_2\)

Verified Solution

Answer & Solution

Correct Answer

(B) \(\mathrm{CH}_3 \mathrm{COONa}\)

Step-by-step Solution

Detailed explanation

The pH of a solution depends on hydrolysis of the salt. The salt \(\mathrm{Na}_2 \mathrm{SO}_4\) is derived from strong acid and strong base, therefore it hydrolyses to a neutral solution. The other two salts are products of weak bases such as \(\mathrm{NH}_4 \mathrm{OH}\) and \(\mathrm{Cu}(\mathrm{OH})_2\). Only \(\mathrm{CH}_3 \mathrm{COONa}\) comes from strong base NaOH , forming a basic solution and therefore colour changes from red to blue.

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.

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