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Subjects
Science CBSE
Class 7
Physical and chemical changes
Types of changes in chemistry

1. Choose the correct answer

Exercise condition:

3 m.

1. Rusting of iron can be prevented by __________.

Exposure to water
Coating with paint or grease
Exposure to air
Crystallisation

2. Chemical change involves __________.

chopping of wood
no new substance formation
reversible change
formation of new substance

3. Physical changes sometimes occur with change in __________.

colour
light
heat
radiation

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