For the purification of alumina,the modern pr | vedclass

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(D) The purification of bauxite ore (alumina) depends on the nature of the impurities present:$(i)$ When the impurity is primarily iron oxides $(Fe_2O

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For $(i)$ Baeyer's process; for $(ii)$ Serpeck's process

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(D) The purification of bauxite ore (alumina) depends on the nature of the impurities present:$(i)$ When the impurity is primarily iron oxides $(Fe_2O_3)$,Baeyer's process is used. In this process,bauxite is treated with concentrated $NaOH$ solution,which dissolves alumina but leaves iron oxide as red mud.$(ii)$ When the impurity is primarily silica $(SiO_2)$,Serpeck's process is used. In this process,bauxite is heated with coke and nitrogen at high temperatures to form aluminum nitride $(AlN)$,while silica is removed as silicon vapor or slag.

For the purification of alumina,the modern processes most useful when $(i)$ the impurity present is a lot of iron oxides and $(ii)$ the impurity present is a lot of silica,are:

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