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JEE Advanced levelSingle correct optionDifficulty 3 of 3mt157

Copper is refined electrolytically in acidified using an anode that is Cu, Zn and Ag by mass. A steady current of passes for with every coulomb used in anodic dissolution of Cu and Zn in proportion to their masses (Ag falls as mud) and in deposition of Cu only at the cathode. Taking Cu = 63.5, Zn = 65 and F = 96500 C/mol, the copper content of the electrolyte (as grams of Cu) changes by

  1. Aa decrease of
  2. Ban increase of
  3. Cno change
  4. Da decrease of

Answer: A

Charge is . Per gram of anode the electrons supplied are , so of anode dissolves, releasing Cu and Zn into solution. The cathode deposits Cu, so the electrolyte loses of Cu.
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