Question
In the context of the Hall - Heroult process for the extractionof $$Al,$$ which of the following statements is false?
A.
$$A{l^{3 + }}$$ is reduced at the cathode to form $$Al$$
B.
$$N{a_3}Al{F_6}$$ serves as the electrolyte
C.
$$CO$$ and $$C{O_2}$$ are produced in this process
D.
$$A{l_2}{O_3}$$ is mixed with $$Ca{F_2}$$ which lowers the melting point of the mixture and brings conductivit $$119y$$
Answer :
$$N{a_3}Al{F_6}$$ serves as the electrolyte
Solution :
In the metallurgy of aluminium, purified $$A{l_2}{O_3}$$ is mixed with $$N{a_3}Al{F_6}\,\,{\text{or}}\,\,Ca{F_2}$$ which lowers the melting point of the mix and brings conductivity.