EASY
9th ICSE
IMPORTANT
Earn 100

Name the gases removed from the air:

Photosynthesis.

Important Questions on Chemical Changes and Reactions

EASY
9th ICSE
IMPORTANT
S. Chand's ICSE CHEMISTRY Book -1 CLASS- 9>Chapter 2 - Chemical Changes and Reactions>Questions>Q 27
State two important processes which release CO2 into the atmosphere.
EASY
9th ICSE
IMPORTANT
S. Chand's ICSE CHEMISTRY Book -1 CLASS- 9>Chapter 2 - Chemical Changes and Reactions>Questions>Q 27
State two important processes which remove CO2 from the atmosphere.
EASY
9th ICSE
IMPORTANT
S. Chand's ICSE CHEMISTRY Book -1 CLASS- 9>Chapter 2 - Chemical Changes and Reactions>Questions>Q 28

Give one example of the following:

(a) Double decomposition reaction.

MEDIUM
9th ICSE
IMPORTANT
S. Chand's ICSE CHEMISTRY Book -1 CLASS- 9>Chapter 2 - Chemical Changes and Reactions>Questions>Q 28

Give one example of the following:

(b) Redox reaction.

MEDIUM
9th ICSE
IMPORTANT
S. Chand's ICSE CHEMISTRY Book -1 CLASS- 9>Chapter 2 - Chemical Changes and Reactions>Questions>Q 32

Briefly explain how you would obtain CO from a mixture of CO and CO2?

EASY
9th ICSE
IMPORTANT
S. Chand's ICSE CHEMISTRY Book -1 CLASS- 9>Chapter 2 - Chemical Changes and Reactions>Questions>Q 33
What is meant by the term “atomicity of gas"?
EASY
9th ICSE
IMPORTANT
S. Chand's ICSE CHEMISTRY Book -1 CLASS- 9>Chapter 2 - Chemical Changes and Reactions>Questions>Q 33
Name a gas that is diatomic.
EASY
9th ICSE
IMPORTANT
S. Chand's ICSE CHEMISTRY Book -1 CLASS- 9>Chapter 2 - Chemical Changes and Reactions>Questions>Q 34
Name a common substance that exists in all the three states of matter.