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JEE Advanced levelSingle correct optionDifficulty 3 of 3mt051

A Hall-Heroult cell carries for with current efficiency. The anode gas is an equimolar mixture of and . With , , , the masses of aluminium produced and of carbon anode consumed are

  1. A134.30 kg and 44.77 kg
  2. B134.30 kg and 59.69 kg
  3. C134.30 kg and 89.53 kg
  4. D100.73 kg and 59.69 kg

Answer: B

Charge , i.e. 14922.3 mol of electrons. Al: mol . For one plus one the carbon gives electrons from 2 C atoms, i.e. 3 electrons per carbon, so C mol .
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