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Subjects
Science State Board
Class 8
Air
Properties and uses of gases and global warming
6.
Oxygen, nitrogen, carbon dioxide: physical properties
Exercise condition:
3
m.
Answer variants:
Its triatomic form occurs at upper layer of the atmosphere
Used in Haber's process
Heavier than air
1
.
Oxygen
2
.
Nitrogen
3
.
Carbon dioxide
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