Chemistry
Explain why in the electrolysis of alumina using the Hall Heroult's process the electrolyte is covered with powdered coke.
Metallurgy
20 Likes
Answer
The layer of powdered coke is sprinkled over the electrolytic mixture as :
- it prevents burning of carbon electrodes in air at the emergence point from the bath.
- it minimizes or prevents heat loss by radiation.
Answered By
11 Likes
Related Questions
Describe the role played in the extraction of aluminium by each of the substances listed.
- Cryolite
- Sodium hydroxide
- Graphite
Select the correct answer from A, B, C and D : The two main metals in Bronze are :
(A) Copper and zinc
(B) Copper and lead
(C) Copper and nickel
(D) Copper and tinA metal 'X' has a valency 2 and a non-metal 'Y' has a valency 3. Write an equation to show how 'Y' forms an ion.
Fill in the blanks from the choices given :
Metals are good …………… [oxidizing agents / reducing agents] because they are electron …………… [acceptors/donors].