A sample of air containing four gases only is analysed.
99.0% of the sample contains the two main gases in the same percentages as in clean, dry air.
The remaining 1.0% of the sample contains argon and carbon dioxide.
The gas that makes up 0.1% of the sample turns limewater milky.
Which row shows the percentage composition of the sample of air?
A
2 )
B
3 )
C
4 )
D
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