The electrolytes usually used in the electroplating of gold and silver, respectively are :
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- \(\mathrm{[Au(CN)_2]^-}\) and \(\mathrm{[Ag(CN)_2]^-}\)
- \(\mathrm{[Au(CN)_2]^-}\) and \(\mathrm{[Ag(Cl)_2]^-}\)
- \(\mathrm{[Au(OH)_4]^-}\) and \(\mathrm{[Ag(OH)_2]^-}\)
- \(\mathrm{[Au(NH_3)_2]^-}\) and \(\mathrm{[Ag(CN)_2]^-}\)
The Correct Option is A
Solution and Explanation
Gold plating uses \(\mathrm{K[Au(CN)_2]}\) and silver plating uses \(\mathrm{K[Ag(CN)_2]}\), i.e. the dicyanoaurate(I) and dicyanoargentate(I) ions.
The hydroxo, chloro and ammine complexes in the other options are not the standard electroplating electrolytes.
Answer: (1) \(\mathrm{[Au(CN)_2]^-}\) and \(\mathrm{[Ag(CN)_2]^-}\)
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