When item of jewellery made of metals such as copper r nicker are placed in a solution having a salt of gold, a thin film of gold is deposited by:

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When item of jewellery made of metals such as copper r nicker are placed in a solution having a salt of gold, a thin film of gold is deposited by:

Heating above 100 degree C

passing an electric current

Just keeping it for10 minutes

Cooling to below 0 degree C