Atmospheric composition (GK): What is the major constituent of dry air near sea level by volume? Choose the correct option.
IIT JEE
Chemistry
Difficulty: Easy
Choose an option
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AOxygen (~21%)
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BNitrogen (~78%)
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CCarbon dioxide (~0.04%)
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DArgon (~0.93%)
Answer
Correct Answer: Nitrogen (~78%)
Explanation
ConceptDry air near sea level is composed primarily of nitrogen (~78%), then oxygen (~21%), argon (~0.93%), and trace gases including CO₂.
Final AnswerNitrogen (~78%)