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Q.

Arrange the following gases present in atmosphere in the decreasing order of volume :

I. Helium
II. Oxygen
III. Nitrogen
IV. Argon
A (I), (III), (III), (IV)
B (II), (III), (IV), (I)
C (III), (II), (IV), (I)
D (IV), (III), (I), (II)
Answer & Explanation
Option: [C]

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