A) Two-thirds nitrogen, two-thirds oxygen, and one-tenth other gases
B) Three-quarters oxygen and one-third nitrogen and other gases
C) One-half nitrogen and one-half oxygen and other gases
D) One-fifth oxygen and four-fifths nitrogen and other gases
Correct Answer: D
Solution :
Air is a mixture of gases. About 78% is nitrogen, 21% is oxygen and the remaining 1% is mainly argon and carbon dioxide. Air also contains varying amounts of water vapour, dust particles and smoke.
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