In the context of the Hall-Heroult process for the extraction of Al, which of the following statements is false?

Question

In the context of the Hall-Heroult process for the extraction of Al, which of the following statements is false? (A) CO and CO2 are produced in this process (B) Al2O3 is mixed with CaF2 which lowers the melting point of the mixture and brings conductivity (C) Al3+ is reduced at the cathode to form Al (D) Na3AlF6 serves as the electrolyte

Tardigrade Admin · Accepted Answer

(a) In Hall-Heroult process for extraction of

A l

, carbon anode is oxidised to

CO

and

C O_{2}

.
(b) When

A l_{2} O_{3}

is mixed with

C a F_{2}

, it lowers the melting point of the mixture and brings conductivity.
(c)

A l^{3 +}

is reduced at cathode to form

A l

.
(d) Here,

A l_{2} O_{3}

is an electrolyte, undergoing the redox process.

N a_{3} A l F_{6}

although is an electrolyte but serves as a solvent, not electrolyte.

Q. In the context of the Hall-Heroult process for the extraction of $A l$ , which of the following statements is false?

$CO$ and $C O_{2}$ are produced in this process

$A l_{2} O_{3}$ is mixed with $C a F_{2}$ which lowers the melting point of the mixture and brings conductivity

$A l^{3 +}$ is reduced at the cathode to form $A l$

$N a_{3} A l F_{6}$ serves as the electrolyte

Q. In the context of the Hall-Heroult process for the extraction of Al, which of the following statements is false?

CO and CO2​ are produced in this process

Al2​O3​ is mixed with CaF2​ which lowers the melting point of the mixture and brings conductivity

Al3+ is reduced at the cathode to form Al

Na3​AlF6​ serves as the electrolyte

Q. In the context of the Hall-Heroult process for the extraction of $A l$ , which of the following statements is false?

$CO$ and $C O_{2}$ are produced in this process

$A l_{2} O_{3}$ is mixed with $C a F_{2}$ which lowers the melting point of the mixture and brings conductivity

$A l^{3 +}$ is reduced at the cathode to form $A l$

$N a_{3} A l F_{6}$ serves as the electrolyte