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Chemistry

Explain why in the electrolysis of alumina using the Hall Heroult's process the electrolyte is covered with powdered coke.

Metallurgy

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Answer

The layer of powdered coke is sprinkled over the electrolytic mixture as :

  1. it prevents burning of carbon electrodes in air at the emergence point from the bath.
  2. it minimizes or prevents heat loss by radiation.

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