Electrolytic Reduction of Alumina

Q. The Hall–Héroult process is used in the production of:

1. Copper
2. Aluminium
3. Magnesium
4. Silver

Q. In the electrolytic extraction of aluminium, the substance added to reduce the melting point of alumina is .

1. cryolite
2. flourspar
3. graphite

Q. Among the following reactions, which one occurs at the cathode in the Hall–Héroult process?

1. $A{l}^{3+}+3e^{-}\to Al$
2. $2O{}^{2-}\to O_2+4e^{-}$
3. $3C+1.5O_2\to 3CO$
4. $2F^{-}\to F_2+2e^{-}$

Q. Match the following components involved in the electrolytic refining of aluminium with its corresponding pair.

1. Molten crude $Al$
2. $N{a}_{3}Al{F}_6+Ba{F}_2$
3. Pure $Al$

Q. Among the following reactions, which one occurs at the cathode in the Hall–Héroult process?

1. $A{l}^{3+}+3e^{-}\to Al$
2. $2O{}^{2-}\to O_2+4e^{-}$
3. $3C+1.5O_2\to 3CO$
4. $2F^{-}\to F_2+2e^{-}$

Q. Which of the following is an environment-friendly reducing agent?

1. Chlorine
2. Hydrogen
3. Carbon
4. Sodium

Q.

Complete the following

2Al2O3+3C→4X+3Y. X & Y are andrespectively.

1. $Al$
2. $C{O}_2$
3. $CO$
4. $AlC$

Q. When alumina is subjected to electrolysis, the aluminium is obtained at the anode.

1. True
2. False

Q. Among the following reactions, which one occurs at the cathode in the Hall–Héroult process?

1. $A{l}^{3+}+3e^{-}\to Al$
2. $2O{}^{2-}\to O_2+4e^{-}$
3. $3C+1.5O_2\to 3CO$
4. $2F^{-}\to F_2+2e^{-}$