When items or jewellery made of metals such as copper or nickel are placed in a solution having a salt of gold, a thin film Chemistry - Questions and Answers

When items or jewellery made of metals such as copper or nickel are placed in a solution having a salt of gold, a thin film of gold is deposited by

(a)cooling to below 0°C

(b)heating above 100°C

(c)passing an electric current Right sign

(d)just keeping it for 10 min

Details:NA

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