Hydro-metallurgical process of extraction of metals is based on :

Complex formation

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Hydrolysis

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Dehydration

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Dehydrogenation

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Solution

The correct option is A Complex formation
Hydrometallurgy is a technique involving the use of aqueous chemistry for the recovery of metals from ores, concentrates, and recycled or residual materials. This process is used in extraction of less electro positive or less reactive metals like gold and silver by complex formation.

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