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Chemistry Some Basic Concepts of Chemistry General Single Correct MCQ
Published on: August 14, 2026

One sample of atmospheric air is found to have 0.03% of carbon dioxide and another sample 0.04%. This is evidence that

A
The law of constant composition is not always true
B
The law of multiple proportions is true
C
Air is a compound
D
Air is a mixture

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The correct answer is:
D
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