Cambridge IGCSE Chemistry practice
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At a glance
MCQ
Type
cambridge_mcq
Style
Topic
Air quality and climate
Exam-style question
What is the approximate percentage of nitrogen in clean, dry air?.
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Flashcard 1 of 6
Question 1 of 5
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Description
Clean, dry air is composed of approximately 78% nitrogen, 21% oxygen, and trace amounts of noble gases and carbon dioxide.
State the two most abundant gases in clean, dry air.
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