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  4. The electrolytes usually used in the electroplating of gold and silver, respectively, are :

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Q. The electrolytes usually used in the electroplating of gold and silver, respectively, are :

JEE MainJEE Main 2019General Principles and Processes of Isolation of Elements

Solution:

The Anode is a bar of silver metal, and the electrolyte (the liquid in between the electrodes) is a solution of Silver cyanide, $\left[ Ag ( CN )_{2}\right]^{-}$, in water. Gold plating is done in much the same way, using a gold anode and an electrolyte containing Gold cyanide, $\left[ Au ( CN )_{2}\right]^{-}$.