Question

5. ___________ gas is so heavy that it settles in the lower layer of the air.

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Answer 1

Answer:

$\underline{\huge{Answer:-}}$

Though carbon dioxide is heavier than air, but it has a tendency to mix with other gases of air and since the rest gases are found at higher altitude so the carbon dioxide could not be able to be in the lower layer of atmospheric air. ... Hence, the concentration of Oxygen is greater than CO2.