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? | Option | 99.0\% of the sample | 0.9\% of the sample | 0.1\% of the sample |
Explanation
The gas that makes up 0.1% of the sample turns limewater milky, which indicates the presence of carbon dioxide. The remaining 1.0% of the sample contains argon and carbon dioxide, so the correct option is the one with carbon dioxide in the 0.1% row.
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