MEDIUM
7th CBSE
IMPORTANT
Earn 100

Rust is formed when iron reacts with water and 

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Important Questions on Changes Around Us

MEDIUM
7th CBSE
IMPORTANT
SCIENCE ROUTE 7>Chapter 9 - Changes Around Us>EXERCISES>Q I
Iron is usually galvanized with 
EASY
7th CBSE
IMPORTANT
SCIENCE ROUTE 7>Chapter 9 - Changes Around Us>EXERCISES>Q I
Common salt from the sea is obtained through the process of 
EASY
7th CBSE
IMPORTANT
SCIENCE ROUTE 7>Chapter 9 - Changes Around Us>EXERCISES>Q II

A _____ change does not form any new substance.

(Clues-reversible, chemical, physical, air, chemical)

EASY
7th CBSE
IMPORTANT
SCIENCE ROUTE 7>Chapter 9 - Changes Around Us>EXERCISES>Q II

A _____ change is also called a chemical reaction.

(Clues- reversible, chemical, physical, air, chemical)

EASY
7th CBSE
IMPORTANT
SCIENCE ROUTE 7>Chapter 9 - Changes Around Us>EXERCISES>Q II

Rusting of iron takes place in the presence of moisture and _____.

(Clues- reversible, chemical, physical, air, chemical)

MEDIUM
7th CBSE
IMPORTANT
SCIENCE ROUTE 7>Chapter 9 - Changes Around Us>EXERCISES>Q II

Formation of manure from leaves is a _____ change. 

(Clues- reversible, chemical, physical, air, chemical)

EASY
7th CBSE
IMPORTANT
SCIENCE ROUTE 7>Chapter 9 - Changes Around Us>EXERCISES>Q II

A physical change is a _____ change.

(Clues- reversible, chemical, irreversible)

EASY
7th CBSE
IMPORTANT
SCIENCE ROUTE 7>Chapter 9 - Changes Around Us>EXERCISES>Q III
Is a physical change temporary or permanent?