When items of jewellery made of metals such as copper or nickel are p – McqOptions

MCQOPTIONS

1.	When items of 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.	passing an electric current
B.	cooling to below 0 degree C
C.	heating above 100 degree C
D.	just keeping it for 10 minutes
Answer» B. cooling to below 0 degree C

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