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Air and Atmosphere — CHEMISTRY STD 7 — Question

ICSE BoardEnglish MediumSTD 7CHEMISTRYAir and Atmosphere1 Mark
Question
Statement given below is incorrect. Write the correct statement :
The percentage of oxygen in air by volume, varies from 21% to 22%.
✓

Answer

The percentage of oxygen in air by volume, varies from 20.8% to 20.9%.

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