EASY
7th CBSE
IMPORTANT
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Souring of milk is a change. (physical / chemical)

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Important Questions on Physical and Chemical Changes

EASY
7th CBSE
IMPORTANT
AWARENESS SCIENCE for Seventh Class>Chapter 6 - Physical and Chemical Changes>Very Short Answer Type Questions>Q 10
The chemical name of baking soda is _____ carbonate.
EASY
7th CBSE
IMPORTANT
AWARENESS SCIENCE for Seventh Class>Chapter 6 - Physical and Chemical Changes>Very Short Answer Type Questions>Q 10
Some substances can be obtained in a pure state from their solutions by _____.
EASY
7th CBSE
IMPORTANT
AWARENESS SCIENCE for Seventh Class>Chapter 6 - Physical and Chemical Changes>Short Answer Type Questions>Q 11
Why is an iron grill painted frequently?
MEDIUM
7th CBSE
IMPORTANT
AWARENESS SCIENCE for Seventh Class>Chapter 6 - Physical and Chemical Changes>Short Answer Type Questions>Q 12
Explain why, iron pipes for carrying water are coated with zinc?
MEDIUM
7th CBSE
IMPORTANT
AWARENESS SCIENCE for Seventh Class>Chapter 6 - Physical and Chemical Changes>Short Answer Type Questions>Q 13
Why are the tools and machine parts made of iron smeared with grease or oil?
MEDIUM
7th CBSE
IMPORTANT
AWARENESS SCIENCE for Seventh Class>Chapter 6 - Physical and Chemical Changes>Short Answer Type Questions>Q 14
Explain how, painting of an iron gate prevents it from rusting. 
MEDIUM
7th CBSE
IMPORTANT
AWARENESS SCIENCE for Seventh Class>Chapter 6 - Physical and Chemical Changes>Short Answer Type Questions>Q 15
  Explain why, rusting of an iron objects are faster in coastal areas than in deserts?
HARD
7th CBSE
IMPORTANT
AWARENESS SCIENCE for Seventh Class>Chapter 6 - Physical and Chemical Changes>Short Answer Type Questions>Q 16
What is meant by galvanisation? Why is it done?