Impure aluminium is purified by

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(C) All processes are used in $Aluminium$ metallurgy,but the $Hoopes$ process is an electrolytic refining process used to obtain $Aluminium$ metal of

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Hoop's process

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(C) All processes are used in $Aluminium$ metallurgy,but the $Hoopes$ process is an electrolytic refining process used to obtain $Aluminium$ metal of very high purity $(99.99\%)$.$1$. The $Bayer$ process is the principal industrial means of refining bauxite to produce alumina $(Al_2O_3)$.$2$. The $Hall-Héroult$ process is the major industrial process for smelting $Aluminium$ from alumina.$3$. $Serpeck's$ process is used for the purification of bauxite ore containing silica $(SiO_2)$ as the main impurity.

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