Which of the following is wrong about electrolysis?
Correct answer: C. It is used for the extraction of blistered copper from electrolytic copper
- A. Extraction of sodium by the electrolysis of fused NaCI is carried in Down's cell
- B. Ca and Mg metals are extracted by the electrolysis of their fused chlorides
- C. It is used for the extraction of blistered copper from electrolytic copper
- D. Aluminium is extracted by electrolyzing fused bauxite (AI2O3 .2H2O) in the presence of fused cryolite (Na3AIF6)
Explanation
The correct answer is C) It is used for the extraction of blistered copper from electrolytic copper. This statement is incorrect because blistered copper is not extracted from electrolytic copper using electrolysis. Blistered copper is obtained from smelting copper sulfide ores and contains impurities. Electrolysis is used in the purification of copper but not in the extraction of blistered copper. Option A is correct as sodium is extracted using the Down's cell. Option B is correct as calcium and magnesium are extracted from their fused chlorides. Option D is misleading in suggesting the use of fused bauxite directly; instead, alumina derived from bauxite is used in the Hall-Héroult process.
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