The process used for purification of $A l_{2} O_{3} .2 H_{2} O$ is:

Magnetic separation

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Froth flotation

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Leaching

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Liquation

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Solution

The correct option is B Leaching
$A l_{2} O_{3} \cdot 2 H_{2} O$ is purified by leaching. This process is also called Bayer's process.
Chemical leaching is useful in the concentration of bauxite.
The bauxite ore is soluble in aqueous sodium hydroxide or aqueous sodium carbonate solution. The impurities such as ferric oxide are insoluble.

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