1.

The electrolytic bath used in gold plating of copper articles, contains : (a) KCN + AuCl3 (b) CuSO4 (c) AuCl3 (d) molten gold

Answer»

Correct option (a) KCN + AuCl3

Explanation:

KCN and AuCl3 combine together forming a complex salt K[Au(CN)4]. This complex salt releases gold slowly giving co-herent gold film on the article to be gold plated.



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