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Question
Atmospheric air contains the following in varying amounts
(a) Nitrogen
(b) Carbon dioxide
(c) Argon
(d) Oxygen
Options:
A .  (d), (a), (b), (c)
B .  (a), (c), (b), (d)
C .  (b), (a), (c), (d)
D .  (a), (d), (c), (b)
Answer: Option D
:
D
Option:(d)

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