MHT CET · Chemistry · Electrochemistry

Which among the following is an example of metal-sparingly soluble salt electrode?

A \(\mathrm{OH}^{-}\) (aq.) \(\mid \mathrm{O}_{2(\mathrm{~g})}, \mathrm{Pt}\)
B \(\mathrm{Cl}^{-}\) (aq.) \(\left|\mathrm{AgCl}_{(\mathrm{s})}\right| \mathrm{Ag}_{(\mathrm{s})}\)
C \(\mathrm{Zn}^{2+}\) (aq.) \(\mid \mathrm{Zn}(\mathrm{s})\)
D \(\mathrm{Cu}^{+}\) (aq.), \(\mathrm{Cu}^{2+}\) (aq.) \(\mathrm{Pt}\)

Verified Solution

Answer & Solution

Correct Answer

(B) \(\mathrm{Cl}^{-}\) (aq.) \(\left|\mathrm{AgCl}_{(\mathrm{s})}\right| \mathrm{Ag}_{(\mathrm{s})}\)

Step-by-step Solution

Detailed explanation

Ag/AgCl is a second type electrode in which the metal is in contact wit its low soluble salt and the anion of that salt. In your case, the metal is Ag in contact with its low soluble salt AgCl + its anion Cl(-) and the reaction is AgCl + e = Ag + Cl(-). This reaction is the half cell of Ag/AgCl ref. electrode.

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.

Same subject

Explore more questions on app

From MHT CET

Explore more questions on app