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A teacher gave H₂O and H₂O₂ as examples. For which law are these good examples?

Answer and explanation

Correct answer: Law of multiple proportions

These formulas illustrate the law of multiple proportions. Hydrogen and oxygen form two different compounds, H₂O and H₂O₂. For a fixed mass of hydrogen, the masses of oxygen that combine in the two compounds are in a simple whole-number ratio: the oxygen amount in H₂O₂ is twice that in H₂O. The same two elements therefore combine in more than one ratio, giving option B. The law of definite proportions would describe one pure compound having one fixed composition, not two compounds with different formulas. Conservation of mass concerns the total mass before and after a reaction, and solubility is unrelated to these formulas. The essential clues are the same two elements and different, simple whole-number compositions.

Related tags

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

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