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Q.

Which of the following gas/es present in the air has the least percentage amount?


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a

Oxygen

b

Carbon dioxide

c

Nitrogen

d

None of these  

answer is B.

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Detailed Solution

Carbon dioxide present in the air has the least percentage amount.
The layer of gases that surround the planet is the atmosphere. Nitrogen, oxygen, carbon dioxide, and argon are the major gases present in the atmosphere.
The percentage of carbon dioxide is the least in the air, which is only 0.03%. The percentage of  oxygen  21%, argon  0.93%, nitrogen 78%. All these other gases also have more percentages than carbon dioxide in the atmosphere.
 
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