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Question
Which of the gases are present in the air.
Which of the gases are present in the air.
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Solution
The correct option is D Helium
The explanation for correct options
Option A
Air is a mixture of gases in which all constituents retain their properties.
Air contains 21 % of oxygen.
Option B
The nitrogen percentage in the air is 78. It is essential for the growth of plants.
Option C
At ground level, the average concentration of hydrogen content is 0.6 ppm (parts per million) in air.
Option D
Helium is found at around 5 ppm in ordinary air.
Thus all options are correct
Helium
The explanation for correct options
Option A
Air is a mixture of gases in which all constituents retain their properties.
Air contains 21 % of oxygen.
Option B
The nitrogen percentage in the air is 78. It is essential for the growth of plants.
Option C
At ground level, the average concentration of hydrogen content is 0.6 ppm (parts per million) in air.
Option D
Helium is found at around 5 ppm in ordinary air.
Thus all options are correct
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