Which of the following changes is not a physical change?

Glowing of filament in bulb

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Combustion

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Boiling of water

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Sublimation

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Solution

The correct option is D Combustion
Combustion represents a chemical reaction whereby the carbon compounds are converted into different chemicals like carbon dioxide and water vapor in presence of oxygen. So this is a chemical change.

The other options are physical changes as there is no change in the chemical composition of the substances in these processes.

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