1.

Gold is extracted by hydrometallurgical process based on its property

Answer»

of being electropositive
of being less reactive
 to FORM complexes which are water soluble
to form salts which are water soluble

Solution :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)]`


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