A sample of expired air is collected in a gas jar. Another gas jar contains normal atmospheric air. A lighted candle is placed inside each gas jar as shown. The time taken for each flame to go out is measured. As the candles burn they use up the oxygen available in the jar.

Jar X contains atmospheric air which has more carbon dioxide.

Jar X contains expired air which has more carbon dioxide.

Jar Y contains atmospheric air which has less oxygen.

Jar Y contains expired air which has less oxygen.

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