Which of the following metals is not extracted by leaching?

Aluminium

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Mercury

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Silver

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Gold

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Solution

The correct option is C Mercury
Leaching is a process where ore is soluble and impurities are insoluble, widely used extractive metallurgy technique which converts metals into soluble salts in aqueous media.
Bauxite, SIlver and gold ores are usually soluble in some solvents and hence leaching is used to concentrate them.
Hence, option $B$ is the correct answer.

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