AP EAMCET · Chemistry · Electrochemistry

Which of the following statements is correct for the cell \(\mathrm{Zn}\left|\mathrm{Zn}^{+2} \| \mathrm{Cu}^{+2}\right| \mathrm{Cu}\) ?

A \(\mathrm{Zn}\) is reducing agent.
B Cu is anode.
C \(\mathrm{Cu}\) is oxidising agent.
D The cell reaction is \(\mathrm{Zn}+\mathrm{Cu}^{+2} \longrightarrow \mathrm{Zn}^{+2}+\mathrm{Cu}\)

Verified Solution

Answer & Solution

Correct Answer

(D) The cell reaction is \(\mathrm{Zn}+\mathrm{Cu}^{+2} \longrightarrow \mathrm{Zn}^{+2}+\mathrm{Cu}\)

Step-by-step Solution

Detailed explanation

In the Daniell cell, copper and zinc electrodes are immersed in a solution of copper(II) sulphate and zinc sulphate, respectively. At the anode (negative electrode), zinc is oxidised per the following half reaction.…

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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