Answer the following questions based on the extraction of aluminium fr

1.	Answer the following questions based on the extraction of aluminium from alumina by Hall – Heroult’s Process:(i) What is the function of cryolite used along with alumina as the electrolyte?(ii) Why is powdered coke sprinkled on top of the electrolyte?(iii) Name the electrode, from which aluminium is collected.
Answer» (i) Cryolite acts as a solvent and lower the fusion temperature from 2050°C to 950°C. (ii) A layer of powdered coke is sprinkled over the surface of the electrolyte to reduce the heat loss by radiation and prevent the carbon rod from binning in air. (iii) Cathode

Answer the following questions based on the extraction of aluminium from alumina by Hall – Heroult’s Process:(i) What is the function of cryolite used along with alumina as the electrolyte?(ii) Why is powdered coke sprinkled on top of the electrolyte?(iii) Name the electrode, from which aluminium is collected.

Answer»

(i) Cryolite acts as a solvent and lower the fusion temperature from 2050°C to 950°C.

(ii) A layer of powdered coke is sprinkled over the surface of the electrolyte to reduce the heat loss by radiation and prevent the carbon rod from binning in air.

(iii) Cathode

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