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Cambridge O Level - GCE Guide

Cambridge O Level - GCE Guide

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5 UCLES 2020 5090/21/O/N/20 [Turn over 3 Atmospheric air contains several gases. (a) Complete the table to show the approximate percentage of each gas listed. gas percentage in atmospheric air carbon dioxide oxygen nitrogen [3] (b) (i) Name a gas not listed in the table which will be present in a higher concentration in an industrial region than in the countryside.

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