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In two compounds, a fixed mass of 20 g of A combines with 16 g and 40 g of B, respectively. What is the simplest ratio of the masses of B?

Answer and explanation

Correct answer: 2:5

The governing principle is the law of multiple proportions. When the same mass of one element combines with different masses of another, the latter masses are compared in a simple whole-number ratio. Here A remains fixed at 20 g, so compare B directly in the stated order: 16:40. The greatest common divisor of 16 and 40 is 8. Therefore, 16/8 : 40/8 = 2:5, making option D correct. Option C is the original ratio but not simplified. Option B includes the fixed mass of A and compares unlike quantities. Option A reverses the order to 5:2, whereas the question asks for the first B mass relative to the second.

Related tags

ChemistryLaw Of Multiple ProportionsSimple RatioLaws Of Chemical CombinationClass 11 ChemistrySome Basic Concepts Of ChemistryClass 11 Mcq

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