SATHEE: Redox Reactions And Electrochemistry Ques 617

Redox Reactions And Electrochemistry Ques 617

Question: In the silver plating of copper, $K [A g {(C N)}_{2}]$ is used instead of $A g N O_{3}$ . 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 ${[A g {(C N)}_{2}]}^{-}$ ion

Show Answer

Answer:

Correct Answer: D

Solution:

[d] In the silver plating of copper, $K [A g {(C N)}_{2}]$ is used instead of $A g N O_{3}$ .

Copper being more electropositive readily precipitate silver from their salt solution $C u + 2 A g N O_{3} \overset{}{\to} C u {(N O_{3})}_{2} + A g$ whereas in $K [A g {(C N)}_{2}]$ solution a complex anion ${[A g {(C N)}_{2}]}^{-}$ is formed and hence $A g^{+}$ are less available in the solution and therefore copper cannot displace Ag from its complex ion.

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Redox Reactions And Electrochemistry Ques 617

Question: In the silver plating of copper, K[Ag(CN)2] is used instead of AgNO3 . The reason is

Options:

Answer:

Solution:

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Question: In the silver plating of copper, $K [A g {(C N)}_{2}]$ is used instead of $A g N O_{3}$ . The reason is