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Answer: 4. Law of gaseous volume

Key idea: Dalton's theory was about atoms combining in fixed whole-number ratios, with no concept of gas volumes.

It explains conservation of mass, constant proportions and multiple proportions. It could not explain Gay-Lussac's law of gaseous volumes (this needed Avogadro's idea of molecules). Option (4).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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