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The electrolytes usually used in the ele...

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

A

`[Au(OH)_(4)]^(-) and [Ag(OH)_(2)]^(-)`

B

`[Au(NH_(3))_(2)]^(+) and [Ag(CN)_(2)]^(-)`

C

`[Au(CN)_(2)]^(-) and [AgCl_(2)]^(-)`

D

`[Au(CN)_(2)]^(-) and [Ag(CN)_(2)]^(-)`

Text Solution

Verified by Experts

The correct Answer is:
D
Gold and silver form soluble cyanide complexes.
Hence for electroplating of Au and Ag electrolytes generally used are `[Au(CN)_(2)]^(-) and [Ag(CN)_(2)]^(-)` respectively
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Statement-1:In cyanide process for the extraction of gold and silver from their natives, ores, the cuanide solution acts as a reducing agent to reduce the gold and siver compound present in the ores into the metallic states. Statement-2:In the extraction of gold and silver, the cyanide solution acts as complexing ragent in the presence of air and form their respective soluble complexes.