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A fixed mass of 4 g of element A combines with 7 g and 28 g of element B in two different compounds. Which law is illustrated?

Answer and explanation

Correct answer: Law of multiple proportions

The governing idea is the law of multiple proportions: when two elements form more than one compound, the masses of one element that combine with a fixed mass of the other are in a small whole-number ratio. Here the mass of A is fixed at 4 g, while the masses of B are 7 g and 28 g. Their ratio is 7:28, which simplifies by dividing both terms by 7 to 1:4, a simple whole-number ratio. Therefore, option C is correct. Definite proportions concerns the fixed composition of one pure compound, conservation of mass concerns total mass before and after a reaction, and Gay-Lussac’s law compares reacting gas volumes, not these element masses.

Related tags

ChemistryLaws Of Chemical CombinationMultiple ProportionsSome Basic Concepts Of ChemistryClass 11 Mcq

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