Which of the following process is/are used for concentration of bauxite?

Bayer's process

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Hall-Heroult's process

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Electrolytic reduction of concentrated alumina

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Hoope's process

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Solution

The correct option is A
Bayer's process

Bayer's process is used for concentration of bauxite ore. The end product is concentrated alumina - $A l_{2} O_{3}$ .

Hall-Heroult's process is used for reduction of alumina to aluminium.

Hoopes process is used for refining aluminium.

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