7. D
8. V
III. Long Answer Questions,
1 What is atmosphere? Why is it vital for
our planet?
2. Explain the properties and uses of the two
major constituents of air
3 Describe an experiment to show that
oxygen is necessary for burning
4. How is water vapour added to the air?
5. Air supports life. Justify this statement,
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the blanket of air that surrounds the earth is called as atmosphere the two major consequence of air are nitrogen and oxygen nitrogen helps in the growth of plants and oxygen helps us for living
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