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The electrolytes usually used in the electroplating of gold and silver, respectively, are
1. [Au(OH)4]- and [Ag(OH)2]-
2. [Au(NH3)2]+ and[Ag(CN)2]-
3. [Au(CN)2]- and [Ag(CN)2]-
4. [Au(CN)2]- and [AgCl2]-

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Correct Answer - Option 3 : [Au(CN)2]- and [Ag(CN)2]-

Concept:

Electroplating is a process of coating one metal or metal object with a very thin layer of another metal typically applying a direct electric current. Electrolytes used in the electroplating of gold and silver are given in the table below:

Process

Article to be plated out

Acts as cathode

Pure metal block acts an anode by which electroplating will be done

Electrolyte (aqueous solution)

a) Gold plating

Article

Au(s)

Na[Au(CN)2] (sodium auro-cyanide)

b) Silver plating

Article

Ag(s)

Na[Ag(CN)2] (sodium argento-cyanide)

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