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Subjects
Science CBSE Homework Assignments
Class 7
Physical and chemical changes
Changes in reaction

1. Physical change I

Task:

3 m.

1. Which of the following is a purification process?

Cutting of wood
Crystallisation
Galvanisation
Rusting

2. Chemical change involves __________.

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

3. Burning is accompanied by __________.

heat
both smoke and heat
none of the above
smoke

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