In the purification of bauxite by Hall's process

  • A

    Bauxite ore is heated with $NaOH$ solution at ${50\,^o}C$

  • B

    Bauxite ore is fused with $N{a_2}C{O_3}$

  • C

    Bauxite ore is fused with coke and heated at ${1800\,^o}C$ in a current of nitrogen

  • D

    Bauxite ore is heated with $NaHC{O_3}$

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