Verified Solution • 2025–26 Session moderate

QJEEM19Chc593: JEE Main 2019 Chemistry - Class 12 JEEM19Chc593 Solution: The electrolytes usually used in the electroplating of gold and …

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

Multiple Choice Options

  • A [Au(CN)2]– and [Ag(CN)2]–
  • B [Au(CN)2]– and [Ag(Cl)2]–
  • C [Au(OH)4]– and [Ag(OH)2]–
  • D [Au(NH3)2]– and [Ag(CN)2]–

Step-by-Step Verified Solution

[Au(CN)2]– and [Ag(CN)2]– both are soluble complexes.

[Au(CN)2]– ⇌ Au+ + 2CN-

[Ag(CN)2]– ⇌ Ag+ + 2CN-

The concentration of produced Au+ ion and Ag+ ion due to ionisation is very less which ensure slow deposition and this slow deposition will generate uniform layer on the substance to be electroplated.

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