EASY
7th CBSE
IMPORTANT
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Rusting of iron is a reversible chemical change.

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Important Questions on Physical And Chemical Changes

EASY
7th CBSE
IMPORTANT
Foundation Course Chemistry>Chapter 2 - Physical And Chemical Changes>EXERCISE>Q 6
Crystallisation is an irreversible physical change.
EASY
7th CBSE
IMPORTANT
Foundation Course Chemistry>Chapter 2 - Physical And Chemical Changes>EXERCISE>Q 7
A physical change can be reversible as well as irreversible.
MEDIUM
7th CBSE
IMPORTANT
Foundation Course Chemistry>Chapter 2 - Physical And Chemical Changes>EXERCISE>Q 8
Oxygen gas is evolved when baking soda and vinegar react.
MEDIUM
7th CBSE
IMPORTANT
Foundation Course Chemistry>Chapter 2 - Physical And Chemical Changes>EXERCISE>Q 9
Nitrogen gas turns limewater milky.
EASY
7th CBSE
IMPORTANT
Foundation Course Chemistry>Chapter 2 - Physical And Chemical Changes>EXERCISE>Q 10
Rusting can be prevented by applying a coat of paint or grease.
MEDIUM
7th CBSE
IMPORTANT
Foundation Course Chemistry>Chapter 2 - Physical And Chemical Changes>EXERCISE>Q 11
The green colour of copper sulphate turns blue when iron nail is added to it.
EASY
7th CBSE
IMPORTANT
Foundation Course Chemistry>Chapter 2 - Physical And Chemical Changes>EXERCISE>Q 12
Salt dissolved in sea water can be obtained by evaporation.
EASY
7th CBSE
IMPORTANT
Foundation Course Chemistry>Chapter 2 - Physical And Chemical Changes>EXERCISE>Q 13
Vinegar is common name for acetic acid.