HARD
7th CBSE
IMPORTANT
Earn 100

Why is rusting of iron considered a chemical change?

Important Questions on Physical and Chemical Changes

MEDIUM
7th CBSE
IMPORTANT
Science 7>Chapter 6 - Physical and Chemical Changes>Oral Questions>Q 3
Name an alloy of iron that does not rust. (Stainless steel/ Fernico alloy)
MEDIUM
7th CBSE
IMPORTANT
Science 7>Chapter 6 - Physical and Chemical Changes>Oral Questions>Q 4
Name the two metals involved in galvanisation.
HARD
7th CBSE
IMPORTANT
Science 7>Chapter 6 - Physical and Chemical Changes>Oral Questions>Q 5
Name the process by which common salt is obtained from the sea water.
EASY
7th CBSE
IMPORTANT
Science 7>Chapter 6 - Physical and Chemical Changes>Summative ASSESSMENT>Q 1
Is a physical change reversible or irreversible change?
MEDIUM
7th CBSE
IMPORTANT
Science 7>Chapter 6 - Physical and Chemical Changes>Summative ASSESSMENT>Q 2
What kind of change is the germination of seeds?
MEDIUM
7th CBSE
IMPORTANT
Science 7>Chapter 6 - Physical and Chemical Changes>Summative ASSESSMENT>Q 3
What change does take place during digestion of food?
MEDIUM
7th CBSE
IMPORTANT
Science 7>Chapter 6 - Physical and Chemical Changes>Summative ASSESSMENT>Q 4
A metal, when deposited on the surface of an iron object prevents its rusting. Identify the metal.
MEDIUM
7th CBSE
IMPORTANT
Science 7>Chapter 6 - Physical and Chemical Changes>Summative ASSESSMENT>Q 5
Give an example illustrating the use of crystallisation in industry.