Purification And Characterisation Of Organic Compounds Question 102
Question: Gold is extracted by hydrometallurgical process based on its property
[KCET 2005]
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
Show Answer
Answer:
Correct Answer: C
Solution:
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_2O+\underset{air}{\mathop{O_2}}\to 4K[Au{{(CN)}_2}]+4KOH $
$ 2K[Au{{(CN)}_2}]+Zn\to 2Au+K_2[Zn{{(CN)}_4}] $
BETA
