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About "" by mass of the atmosphere consi...

About `"______"` by mass of the atmosphere consists of dioxygen

A

`23%`

B

`21%`

C

`20%`

D

`25%`

Text Solution

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The correct Answer is:
1
Oxygen exists in the free form as `O_(2)` molecules and make up `20.9%` by volume and `23%` by mass of the atmosphere .The proportion remains constant because the dioxygen consumed during respiration and combustion is continually replaced as a result of photosynthesis.
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