Leaching process is used in one of the stages of metallurgy of:

zinc

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iron

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aluminium

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copper

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Solution

The correct option is D aluminium
In leaching, a suitable reagent (not water) dissolves the ore and not the impurities. Thus, leaching is a chemical method of separation / concentration of the ore from impurities.
Leaching is used in extraction of $A l$ from bauxite.

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