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JEE Main levelSingle correct optionDifficulty 2 of 3mt173

In the electrolytic refining of copper, the anode impurities behave as follows:

  1. Aall impurities pass into solution because they are oxidised at the anode
  2. B and collect as anode mud, while and dissolve
  3. C and pass into solution, while , and collect below the anode as anode mud
  4. Dall impurities deposit on the cathode together with copper

Answer: C

Metals more reactive than copper (, ) are oxidised at the anode and stay as ions in solution. Less reactive metals (, , ) are not oxidised at the working potential and fall as anode mud.
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