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Gold is extracted by hydrometallurgical ...

Gold is extracted by hydrometallurgical procees based on its property

A

Of being electropositive

B

Of being less reactive

C

To form complexes which are water soluble

D

To form salts which are water soluble

Text Solution

Verified by Experts

The correct Answer is:
C
Hydrometallurgy is the process of dissolving the metal or its ore by the action of a suitable chemical regent followed by recovery of the metal either by electrolysis or by the use of a suitable precipitating agent.
`4Au + 8KCN + 2H_(2)O + underset("air")(O_2) rarr 4K[Au(CN)_2] + 4KOH`
`2K[Au(CN)_2] + Zn rarr 2Au + K_2 [Zn(CN)_4]`
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