JEE Main · 2019 · 12 Jan 2019 · Shift 1 · General Principles and Processes of Isolation of Metals

In the Hall-heroult process, aluminium is formed at the cathode. The cathode is made out of

(A)Pure Aluminium
(B)Carbon✓ Correct
(C)Copper
(D)Platinum

Answer: (B)

Solution

In the Hall-Heroult process alumina dissolved in molten cryolite is electrolysed in a carbon-lined cell. The carbon lining itself serves as the cathode, and molten aluminium is deposited on it and collects at the bottom. So the cathode is made of carbon.

JEE Main · 2019 · 12 Jan 2019 · Shift 1 · Single correct option

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