D-And F-Block Elements Ques 224
Question: From argentite $ (Ag_2S) $ ore the method used in obtaining metallic silver is
[MP PMT 1989]
Options:
A) Fused mixture of $ Ag_2S $ and $ KCl $ is electrolysed
B) $ Ag_2S $ is reduced with $ CO $
C) $ Ag_2S $ is roasted to $ Ag_2O $ which is reduced with carbon
D) Treating argentite with $ NaCN $ solution followed by metal displacement with zinc
Show Answer
Answer:
Correct Answer: D
Solution:
$ Ag_2S+4NaCN\to 2Na[Ag{{(CN)}_2}]+Na_2S $
$ 2Na[Ag{{(CN)}_2}]+Zn\to Na_2[Zn{{(CN)}_4}]+2Ag $
