ChemistryChemical combinationJAMB
The law of definite proportions states that
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Answer: A. a pure compound always contains the same elements combined in the same proportion by mass
This is the law of constant composition; the other options are the laws of conservation of mass, combining volumes and Avogadro's law.
An AdmitMe practice question, written for the JAMB syllabus. Not an official past question.