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Coordination Compounds question

2002 · Q86
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Coordination Compounds question

2002 · Q86

NEETChemistryCoordination CompoundsMCQ+4 / −1
In the silver plating of copper, K[Ag(CN)2] is used instead of AgNO3. The reason is
  1. A
    a thin layer of Ag is formed on Cu
  2. B
    more voltage is required
  3. C
    Ag+ ions are completely removed from solution
  4. D
    less availability of Ag+ ions, as Cu can not displace Ag from [Ag(CN)2]−-− ion.
View written solutionFree

Correct answer: D

Copper being more electropositive readily precipitate silver from their salt (Ag+) solution.

Cu + 2AgNO3 →\to→ Cu(NO3)2 + Ag

In K[Ag(CN)2] solution a complex anion [Ag(CN)2]– is formed so Ag+ ions are less available in the solution and Cu cannot displace Ag from this complex ion.

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