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ICSE Class 10 Chemistry Question 35 of 64

Metallurgy — Question 35

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Question 5.2(2015)

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

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.