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JEE Main levelSingle correct optionDifficulty 2 of 3mt131

Blister copper containing dissolved cuprous oxide is stirred with green logs of wood (poling). The purpose is to

  1. Aremove silver and gold as anode mud
  2. Boxidise iron sulphide into slag
  3. Cdistil off arsenic as
  4. Dreduce to copper using the hydrocarbon gases released

Answer: D

Green wood releases reducing gases (hydrocarbons, CO), which convert the cuprous oxide present in the metal back into copper. Silver and gold are removed by electrolytic refining, not by poling.
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