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

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Coke

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(C) The Serpek process is used for the purification of bauxite $(Al_2O_3 \cdot 2H_2O)$ containing silica $(SiO_2)$ as an impurity.In this process,bauxite is heated with coke and nitrogen at $1800 \ ^\circ C$ to form aluminium nitride $(AlN)$.The silica $(SiO_2)$ is reduced by coke to silicon $(Si)$,which then volatilizes at this high temperature.$SiO_2 + 2C \rightarrow Si + 2CO \uparrow$Thus,coke is used to remove silicon dioxide.

In the Serpek process for the purification of bauxite,what is used to remove silicon dioxide?

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