Which of the following electrolytes is used in the electrolyte refining of copper?

Correct option is D

Correct Answer: (D) Copper sulphate

Explanation:

• In the electrolytic refining of copper, an aqueous solution of copper sulphate (CuSO₄) is used as the electrolyte.
• The process involves:
1. Anode: Impure copper, which acts as the source of copper ions.
2. Cathode: Pure copper, where copper ions from the solution deposit as pure copper.
3. Electrolyte: Copper sulphate solution provides the copper ions for the electrochemical process.
• At the anode:

​Cu (impure)→Cu²⁺+2e​

• At the cathode:

Cu²⁺+2e−→Cu (pure)

Why Other Options Are Incorrect:

• (Sodium sulphate): Not used in copper refining; it does not provide copper ions.
• (Cuprous chloride): Not a common electrolyte for copper refining.
• (Copper oxide): It is not soluble in water to act as an effective electrolyte in this process.