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AIIMS 2017 Chemistry Electrolysis Assertion Reason Question

Type: Assertion Reason-conceptual-Medium-Class 12

Assertion (A): At the end of electrolysis using platinum electrodes, an aqueous solution of CuSO4\text{CuSO}_4 turns colourless.

Reason (R): During the electrolysis CuSO4\text{CuSO}_4 changes to Cu(OH)2\text{Cu(OH)}_2 during electrolysis.

A

If both Assertion and Reason are true and Reason is the correct explanation of Assertion.

B

If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

C

If Assertion is true but Reason is false.

D

If both Assertion and Reason are false.

Correct Answer

Option C

Detailed Explanation

Option C is correct because the assertion states that CuSO₄ converts to Cu at the cathode, which is true, as copper ions (Cu²⁺) gain electrons during electrolysis to form solid copper (Cu), leading to the blue solution of CuSO₄ becoming colorless as the copper ions are depleted. However, the reason provided is false; the color change is due to the reduction of Cu²⁺ ions, not because of any other process. Other options are not applicable in this context, as they do not provide relevant information or alternative assertions and reasons. Understanding the electrochemical process clarifies the relationship between ion reduction and color change in solutions.

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