Gold is extracted by hydrometallurgical process based on its property

Options

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

Answer

c

Explanation

Hydrometallurgy is the process of dissolving the metal or its ore by the action of a suitable chemical reagent 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))to`
`4K[Au(CN)_(2)]+4KOH`
`2K[Au(CN)_(2)]+Znto2Au+K_(2)[Zn(CN)_(4)]`