In the extraction of Al,the chemical used in | vedclass

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(B) The Serpek process is used for the purification of bauxite ore $(Al_2O_3 \cdot 2H_2O)$ containing silica $(SiO_2)$ as an impurity.In this process,

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$C + N_2$

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(B) The Serpek process is used for the purification of bauxite ore $(Al_2O_3 \cdot 2H_2O)$ containing silica $(SiO_2)$ as an impurity.In this process,the bauxite ore is heated with coke $(C)$ and nitrogen $(N_2)$ at a temperature of about $1800 \ ^\circ C$.This reaction forms aluminum nitride $(AlN)$: $Al_2O_3 + 3C + N_2 \rightarrow 2AlN + 3CO$.The aluminum nitride is then hydrolyzed to produce aluminum hydroxide,which is further calcined to get pure alumina $(Al_2O_3)$.

In the extraction of $Al$,the chemical used in the Serpek process is:

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