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At the same temperature and pressure, gas volumes are 1 litre, 3 litres, and 2 litres. What is their simplest volume ratio?

Answer and explanation

Correct answer: 1:3:2

The governing concept is the law of combining volumes: when gases are compared at the same temperature and pressure, their volumes can be represented directly as a ratio. The three given volumes are 1 L, 3 L, and 2 L, so the ratio is 1:3:2. To simplify a ratio, divide all terms by their greatest common divisor. Here the greatest common divisor of 1, 3, and 2 is 1, so no reduction is possible. Therefore option A is correct. Option B rearranges the numbers, option C incorrectly makes all volumes equal, and option D changes the original relative sizes. Since the first volume is already 1, the stated ratio is already in simplest form.

Related tags

ChemistryLaws-Of-Chemical-CombinationCombining-VolumesClass-11Laws Of Chemical CombinationSome Basic Concepts Of ChemistryClass 11 Mcq

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