Iron rod turns red on heating. What kind of change is this?

Physical change

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Periodic change

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Physical and chemical change

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Chemical change

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Solution

The correct option is A Physical change
Physical changes are changes affecting the physical state of a chemical substance, but not its chemical composition. In the case of iron, when iron is heated it will get red colour but there is no change in its chemical form so it is not a chemical change, it is only a physical change.

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