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Which example is wrong for the law of multiple proportions?

Answer and explanation

Correct answer: Two identical samples of pure water

The law of multiple proportions applies when the same two elements form two or more different compounds. If the mass of one element is fixed, the masses of the other element that combine with it are in a simple whole-number ratio. Two identical samples of pure water are both merely samples of H₂O, so they provide only one compound and cannot demonstrate multiple proportions. Therefore option A is the wrong example. CO and CO₂, SO₂ and SO₃, and H₂O with H₂O₂ are pairs of distinct compounds made from the same two elements, so each can be used for comparison. The issue is not the physical number of samples but the existence of different compounds and combining ratios.

Related tags

ChemistryMultiple ProportionsChemical Combination LawsLaws Of Chemical CombinationSome Basic Concepts Of ChemistryClass 11 Mcq

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