Question

.In a construction site, iron rods are left in the open air for some time, it
acquires a film of brownish substance.
c) Is it a physical change or a chemical change?

Answer 1

it is a chemical change as a new product is formed which is the film of brownish substance.
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Answer 2

it is a chemical change as when rusting takes place its molecules react with each other to form new molecules.
P.S.TO PREVENT RUSTING,IRON SHOULD BE GALVANISED WITH COPPER AND THIS PROCESS IS KNOWN AS GALVANISATION.
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