Question

"We can show that iron is more reactive than copper (1) by preparing copper sulphate solution and dipping iron strip in it (2) by dipping both the strips in water for some time (3) by preparing iron sulphate solution and dipping copper strip in it (4) by heating both iron and copper strips"

Answer 1

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Answer 2

while heating iron strip It form iron oxide

which is green or brown in colour but when copper strip is heated It form green copper oxide on its surface.