Which gas is the least abundant among the four major components of dry air?

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Prepare for the IGCSE Edexcel Chemistry Test with engaging flashcards and multiple-choice questions. Each question comes with detailed hints and explanations to enhance your learning experience. Master your exam with confidence!

Multiple Choice

Which gas is the least abundant among the four major components of dry air?

Explanation:
In dry air, the two dominant gases are nitrogen and oxygen, making up the vast majority of the atmosphere. The other two gases, argon and carbon dioxide, exist only in trace amounts. Carbon dioxide is the least abundant among them because its concentration is about 0.04% of dry air (roughly 400 parts per million), which is much smaller than argon’s about 0.93%. So the correct choice is carbon dioxide.

In dry air, the two dominant gases are nitrogen and oxygen, making up the vast majority of the atmosphere. The other two gases, argon and carbon dioxide, exist only in trace amounts. Carbon dioxide is the least abundant among them because its concentration is about 0.04% of dry air (roughly 400 parts per million), which is much smaller than argon’s about 0.93%. So the correct choice is carbon dioxide.

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