Question -
The pie chart shows the composition of air. What do X and Y represent respectively?
Options:
A .  Carbon dioxide, Nitrogen
B .  Nitrogen, Oxygen
C .  Nitrogen, Carbon monoxide
D .  Helium, Argon
Answer: Option B : B Air is a mixture of gases which contains: -78% of nitrogen -21% of oxygen -1% of other gases In the given pie chart, 'X' represents nitrogen and 'Y' represents oxygen gas.
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