CTET 2 Math and Science Sep 2014 Paper

Question : 77 of 120

Marks: +1, -0

Air is a mixture of many gases. The percentage by volume, of the gases other than nitrogen and oxygen, i.e., CO2, methane, argon, ozone and water vapour combined together is about

0.1%
1%
21%
78%

Validate

Solution:

Air is a mixture of many gases. The prominent gases are nitrogen, oxygen and argon. Nitrogen accounts for 78%, oxygen 21% and Argon is 0.9% other 0.1%.
Now, except Nitrogen and oxygen
Percentage of air = Argon + others

=0.9+0.1%

=1%

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