CUET · CHEMISTRY · PYQ PAPER 2025

Which one represents the correct reduction reaction for the \(Cu^{2+}/Cu\) half-cell?

A \(\ Cu^{2+}(aq) + 2e^- \rightarrow Cu(s)\)
B \(\ Cu^{2+}(aq) \rightarrow Cu(s) + 2e^-\)
C \(\ Cu(s) \rightarrow Cu^{2+}(aq) + 2e^-\)
D \(\ Cu^{2+}(aq) + 2e^- \rightarrow Cu^+(s) + e^-\)

Verified Solution

Answer & Solution

Correct Answer

(A) \(\ Cu^{2+}(aq) + 2e^- \rightarrow Cu(s)\)

Step-by-step Solution

Detailed explanation

\( Cu^{2+}(aq) + 2e^- \rightarrow Cu(s) \)

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

Match List-l with List-II

List-I (Common Name)	List-II (IUPAC Name)
(A) Diisopropyl ketone	(I) 2-Methylpropanal
(B) Isobutyraldehyde	(II) Prop-2-enal
(C) Phthaldehyde	(III) 2,4-Dimethylpentan-3-one
(D) Acrolein	(IV) Benzene-1,2-dicarbaldehyde

Choose the correct answer from the options given below:

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