EASY
7th CBSE
IMPORTANT
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The percentage of noble gases present in air is more than that of CO2.

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Important Questions on Air and Oxygen

EASY
7th CBSE
IMPORTANT
Pearson IIT Foundation Chemistry>Chapter 4 - Air and Oxygen>PRACTICE QUESTIONS (COMPETITION WING)>Q 9
 Oxygen is neutral towards litmus.
EASY
7th CBSE
IMPORTANT
Pearson IIT Foundation Chemistry>Chapter 4 - Air and Oxygen>PRACTICE QUESTIONS (COMPETITION WING)>Q 10
Gases like nitrogen dioxide, sulphur dioxide present in atmosphere contribute to acid rain.
EASY
7th CBSE
IMPORTANT
Pearson IIT Foundation Chemistry>Chapter 4 - Air and Oxygen>PRACTICE QUESTIONS (COMPETITION WING)>Q 11
CO2 can be used to preserve food grains from destruction by insects.
EASY
7th CBSE
IMPORTANT
Pearson IIT Foundation Chemistry>Chapter 4 - Air and Oxygen>PRACTICE QUESTIONS (COMPETITION WING)>Q 12
CO2 can be collected by the downward displacement of air.
EASY
7th CBSE
IMPORTANT
Pearson IIT Foundation Chemistry>Chapter 4 - Air and Oxygen>PRACTICE QUESTIONS (COMPETITION WING)>Q 13
The electric spark produced during lightening helps nitrogen to combine with oxygen to form nitric oxide.
EASY
7th CBSE
IMPORTANT
Pearson IIT Foundation Chemistry>Chapter 4 - Air and Oxygen>PRACTICE QUESTIONS (COMPETITION WING)>Q 14
Carbogen is a mixture of 94 per cent oxygen, 4 per cent carbon dioxide and 2 per cent nitrogen dioxide.
EASY
7th CBSE
IMPORTANT
Pearson IIT Foundation Chemistry>Chapter 4 - Air and Oxygen>PRACTICE QUESTIONS (COMPETITION WING)>Q 15
Dust particles along with water vapour present in the atmosphere help in the formation of clouds. 
MEDIUM
7th CBSE
IMPORTANT
Pearson IIT Foundation Chemistry>Chapter 4 - Air and Oxygen>PRACTICE QUESTIONS (COMPETITION WING)>Q 16
_____ is present in sun's atmosphere up to 1.1 per cent.