Q.

The most abundant element in the earth’s atmosphere is

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a

O2

b

N2

c

F2

d

Ar

answer is B.

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Detailed Solution

The most abundant  element naturally occurring gas is Nitrogen (N2), which makes up about 78% of air. Oxygen (O2) is the second most abundant gas at about 21%. The inert gas Argon (Ar) is the third most abundant gas at . 93%.
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