HARD
7th CBSE
IMPORTANT
Earn 100

Identify the chemical change from the list given below.
Burning of cooking gas, Sublimation of ammonium chloride, Dissolving sugar in water.

Important Questions on Physical and Chemical Changes

MEDIUM
7th CBSE
IMPORTANT
Science 7>Chapter 6 - Physical and Chemical Changes>Oral Questions>Q 5
What may occur during a chemical change? Mention one.
MEDIUM
7th CBSE
IMPORTANT
Science 7>Chapter 6 - Physical and Chemical Changes>Oral Questions>Q 1
Give the chemical name of the rust.
HARD
7th CBSE
IMPORTANT
Science 7>Chapter 6 - Physical and Chemical Changes>Oral Questions>Q 2
Why is rusting of iron considered a chemical change?
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?