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
When carbon dioxide is passed through lime water, it turns milky due to the formation of _____. (Write the chemical name of the compound formed)
EASY
7th CBSE
IMPORTANT
AWARENESS SCIENCE for Seventh Class>Chapter 6 - Physical and Chemical Changes>Very Short Answer Type Questions>Q 10
The process of depositing a thin layer of zinc on iron objects is called _____. (galvanisation/alloying)
MEDIUM
7th CBSE
IMPORTANT
AWARENESS SCIENCE for Seventh Class>Chapter 6 - Physical and Chemical Changes>Very Short Answer Type Questions>Q 10
The presence of _____ (sand/salt) in sea water makes the process of rust formation on ships faster.
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?