Co-Ordination Compounds Question 267
Question: In the silver plating of copper, $ K[Ag{{( CN )}_2}] $ is used instead of $ AgNO_3 $ . The reason is
Options:
A) a thin layer of Ag is formed on Cu
B) more voltage is required
C) $ A{g^{+}} $ ions are completely removed from solution
D) less availability of $ A{g^{+}} $ ions, as Cu cannot displace Ag from $ {{[Ag{{(CN)}_2}]}^{-}} $ ion.
Show Answer
Answer:
Correct Answer: D
Solution:
In silver plating $ K[Ag{{(CN)}_2}] $ is used which provides constant and required supply of $ A{g^{+}} $ ions as $ Ag{{(CN)}_2}^{-} $ is very stable.
But if $ AgNO_3 $ is used concentration of $ [A{g^{+}}] $ in solution will be very large.
In that case Ag will be deposited at faster rate without any uniformity.
