Question

Among the following which is used as an electrolyte in
electroplating a base metal with gold ?
(a) NH₄Cl (b) K[Au(CN)₂]
(c) HgCN (d) AgCN

Answer 1

The one which is used an electrolyte in electroplating a base metal with gold is

*option: (d) is correct that is AgCN

* The anode for the base is the bar of silver metal and the electrolyte is the silver solution.

*When the current is passed through the silver ions from the silver cyanide it migrate to the negative anode,which further used in base metal with gold.

Answer 2

K[Au(CN)₂] or cyanoaurate is used.

Explanation:

• Electroplating is the process by which a metal is coated with some other metal with the application of electrolysis process.

• Electroplating is done for cosmetic purposes, to prevent corrosion etc.

• In case of gold electroplating, its mainly done to increase the value of the product.

• Gold is a very stable element, and its salt formation is quite difficult.

• So its complexes with potassium cyanide to form potassium cyanoaurate.

• This is prepared in gel form.

• As the electric current is passed through this gel, the gold breaks from solution and gets plated on the cathode.

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