Chemistry miscellaneousHard

Question

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

Options

A.Al3+ is reduced at the cathode to form Al
B.Na3AlF6 serves as the electrolyte
C.CO and CO2 are produced in this process
D.Al2O3 is mixed with CaF2 which lowers the melting point of the mixture and brings conductivity

Solution

In Hall-Heroult cell Electrolyte = Molten mixture of Na3[AlF6] + Al2O3 + CaF2] {CaF2/ Na3AlF6 are added to decrease M.P. of mix.}
Al2O3 → 2Al3+ + 3O2-
At cathode : Al3+ + 3e- → Al(l)
At anode : C + O-2 → CO + 2e- C + 2O-2 → CO2 + 4e-

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