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What situation is compared in the law of multiple proportions?

Answer and explanation

Correct answer: Different compounds of the same two elements

Direct answer: Option D, different compounds formed from the same two elements. The law of multiple proportions applies when two elements combine in more than one compound. We compare the masses of one element that combine with a fixed mass of the other element. These masses show a simple whole-number ratio, such as 1:2. This is a law about composition by mass, not about appearance or one isolated measurement. Option A is wrong because colour differences in one mixture do not show how elements combine. Option B is wrong because the volume of one gas alone does not compare compounds or mass ratios. Option C is wrong because hardness is a physical property of a metal, not a comparison of chemical compositions. Option D is correct because it states the essential condition: the same two elements form different compounds, and their combining masses are compared. Remember: same two elements, different compounds, simple whole-number mass ratio.

Related tags

ChemistryLaws-Of-Chemical-CombinationClass-11

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