Q.

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

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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

Na3 AlF6 serves as the electrolyte.

answer is D.

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Detailed Solution

(a) In Hall-Heroult process for extraction of Al, carbon anode is oxidised to CO and CO2.(b) When Al2O3 is mixed with CaF2, it lowers the melting(c) Al3+ is reduced at cathode to form Al.(d) Here, Al2O3 is an electrolyte, undergoing the redox process.Na3AlF6 although is an electrolyte but serves as a solvent,not electrolyte.
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In the context of the Hall-Heroult process for the extraction of Al, which of the following statements is false ?