Solution 1 (Physical and Chemical Changes)

Rusting is a process in which the iron products get a brownish substance on them in the presence of oxygen and water. This brownish substance, Iron oxide is called rust.

Chemical reaction is given below:

Iron (Fe) + Oxygen (O2) + Water (H2O) → rust(iron oxide Fe2O3)

If the moisture in air is high rusting becomes faster.

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NCERT solutions class 7

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