Chemical leaching is useful in the concentration of:

galena

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bauxite

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cassiterite

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copper pyrities

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Solution

The correct option is B bauxite
Chemical leaching is useful in the concentration of bauxite.
Froth floatation method is used for copper pyrites and galena because both are sulphide ore.
Hydraulic washing method depends upon the difference in the specific gravity of mineral and gangue.This method is used for separating cassiterite from gangue.
Hence, option (a) is the correct option.

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