Chemistry - Metallurgy Question with Solution | TestHub

(A) $2{\mathrm{NaAlO}}_2+3{\mathrm{H}}_2\mathrm{O}+{\mathrm{CO}}_2⟶2\mathrm{Al}(\mathrm{OH}{)}_3+{\mathrm{Na}}_2{\mathrm{CO}}_3$

(B) In Hall-Heroult process ${\mathrm{Na}}_3\mathrm{Al}/{\mathrm{F}}_6$ and ${\mathrm{CaF}}_2$ is mixed with ${\mathrm{Al}}_2{\mathrm{O}}_3$ to lower melting point and increase conductivity.

(C) $\mathrm{Anode}\text{\hspace{0.33em}C}\left(\text{s}\right)+2{\text{O}}^{2-}\left(\text{melt}\right)\to {\text{CO}}_2\left(\text{g}\right)+4{\text{e}}^{-}$

(D) Steel cathode with carbon lining and graphite anode are used.