TS EAMCET · Chemistry · Electrochemistry

During the electrolysis of copper sulphate aqueous solution using copper electrode, the reaction takine place at the cathode is

A \(\mathrm{Cu} \longrightarrow \mathrm{Cu}^{2+}(\mathrm{aq})+2 e^{-}\)
B \(\mathrm{Cu}^{2+}(\mathrm{aq})+2 e^{-} \longrightarrow \mathrm{Cu}(\mathrm{s})\)
C \(\mathrm{H}^{+}(\mathrm{aq})+\mathrm{e}^{-} \longrightarrow \frac{1}{2} \mathrm{H}_2(g)\)
D \(\mathrm{SO}_4^{2-}(\mathrm{aq}) \longrightarrow \mathrm{SO}_3(g)+\frac{1}{2} \mathrm{O}_2(g)+2 e^{-}\)

Verified Solution

Answer & Solution

Correct Answer

(B) \(\mathrm{Cu}^{2+}(\mathrm{aq})+2 e^{-} \longrightarrow \mathrm{Cu}(\mathrm{s})\)

Step-by-step Solution

Detailed explanation

During the electrolysis of an aqueous solution of copper sulphate using copper electrodes, both \(\mathrm{Cu}^{2+}\) and \(\mathrm{H}^{+}\)ions move towards cathode, but the discharge potential of \(\mathrm{Cu}^{2+}\) ions is lower than that of \(\mathrm{H}^{+}\)ions, therefore…

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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