[MP PET 1989]
A) $ Na $
B) $ Cu $
C) $ Ag $
D) $ Fe $
Correct Answer: C
Hydrometallurgy $ Ag_2S+4NaCN\to 2Na[Ag{{(CN)}_2}]+Na_2S $
$ 2Na[Ag{{(CN)}_2}]+Zn\to Na_2[Zn{{(CN)}_4}]+2Ag $
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