D-And F-Block Elements Ques 222
Question: Which of the following metal is obtained by leaching out process using a solution of $ NaCN $ and then precipitating the metal by addition of zinc dust
[NCERT 1984; AIIMS 1983; CBSE PMT 1989]
Options:
A) Copper
B) Silver
C) Nickel
D) Iron
Show Answer
Answer:
Correct Answer: B
Solution:
$ Ag_2S+4NaCN\to 2Na[Ag{{(CN)}_2}]+Na_2S $
$ 2Na[Ag{{(CN)}_2}]+Zn\to Na_2[Zn{{(CN)}_4}]+2Ag $
