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Q.

By volume, the oxygen proportion is:

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a

78%

b

87%

c

21%

d

23%

answer is A.

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Detailed Solution

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  • Other gases, such as phosphorus and argon, make up 1% of the atmosphere, whereas oxygen makes up 21%, nitrogen makes up 78%, and carbon dioxide makes up 0.04 percent.
  • Nitrogen is the most prevalent element in our atmosphere, accounting for 78 percent of the total.
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