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At the same temperature and pressure, gas volumes are 2 litres, 5 litres, and 2 litres. What is their simplest volume ratio?

Answer and explanation

Correct answer: 2:5:2

At identical temperature and pressure, gas volumes are compared by writing them in the same order as given. Thus the ratio is 2:5:2. The three numbers have a greatest common divisor of 1 because 5 is not divisible by 2, so the ratio cannot be reduced further. Option B is therefore correct. Option A would incorrectly make the second volume equal to the first and third; option C subtracts or alters the values without justification; option D also does not preserve the original proportions. This is an elementary application of the combining-volume idea: the numerical volume relationship is retained when all measurements use the same unit and conditions.

Related tags

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

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