SATHEE: Extraction of Metals - Result Question 20

Extraction of Metals - Result Question 20

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

(a) $C O$ and $C O_{2}$ are produced in this process

(2015 Main) (b) $A l_{2} O_{3}$ is mixed with $C a F_{2}$ which lowers the melting point of the mixture and brings conductivity

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

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Solution:

(a) In Hall-Heroult process for extraction Al, carbon anode is oxidised to $C O$ 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.

(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.

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Extraction of Metals - Result Question 20

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