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wave motion and string waves

Which of the following changes is not a physical change?

A

Glowing of filament in bulb

B

Combustion

C

Boiling of water

D

Sublimation

Answer

Physical changes are restricted to changes that result in a difference in display without changing the composition. Combustion represents a chemical reaction whereby the carbon compounds are oxidized into different chemicals like carbon dioxide and water vapor in presence of environmental oxygen. So this is a chemical change. So the correct answer is B

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