Question

Which of the following is not a physical change?

A

Dissolution of sugar or salt in water

B

Powdering of sugar

C

Mixing of iron particles and sand

D

Burning of paper

Medium

Solution

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Correct option is D)

Physical changes are limited to changes that result in a difference in display without changing the composition. Burning  of paper is technically called combustion.  It represents a chemical reaction whereby the carbon compounds in the paper are oxidized into different chemicals like carbon dioxide and water vapor. This is a chemical change.

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