MHT CET · Chemistry · Ionic Equilibrium

Which is not an example of common ion effect?

A \(\mathrm{NaCl}+\mathrm{AgCl}\)
B \(\mathrm{H}_{2} \mathrm{~S}+\mathrm{HCl}\)
C \(\mathrm{CH}_{3} \mathrm{COOH}+\mathrm{NaOH}\)
D \(\mathrm{NH}_{4} \mathrm{OH}+\mathrm{NH}_{4} \mathrm{Cl}\)

Verified Solution

Answer & Solution

Correct Answer

(C) \(\mathrm{CH}_{3} \mathrm{COOH}+\mathrm{NaOH}\)

Step-by-step Solution

Detailed explanation

Common ion effect is the suppression of degree of dissociation of a weak electrolyte in the presence of a strong electrolyte having common ion.
Among the given, \(\mathrm{CH}_{3} \mathrm{COOH}+\mathrm{NaOH}\) has no common ion, thus does not exhibit common ion effect.

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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