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Question:

In the Hall-Heroult process, aluminium is formed at the cathode. The cathode is made out of: platinum, pure aluminium, carbon, copper

copper

platinum

pure aluminium

carbon

Solution:

The hall-heroult process is used for smelting of aluminium. In the Hall-Heroult process, the cathode is made of carbon. Also, here anode is also made up of carbon. Hence, the correct option is carbon.