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
Correct Answer: C
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. \[4Au+8KCN+2{{H}_{2}}O\underset{air}{\mathop{+{{O}_{2}}}}\,\to 4K[Au{{(CN)}_{2}}]\] \[+4KOH\] \[2K\,\,[Au{{(CN)}_{2}}]+Zn\to 2Au+{{K}_{2}}[Zn{{(CN)}_{4}}]\]
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