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At the same temperature and pressure, gas volumes are 3 litres, 12 litres, and 6 litres. What is their simplest volume ratio?

Answer and explanation

Correct answer: 1:4:2

The relevant concept is the volume relationship of gases under the same temperature and pressure. First write the measured values as 3:12:6. Their greatest common divisor is 3. Dividing all terms by 3 gives 3 ÷ 3 : 12 ÷ 3 : 6 ÷ 3 = 1:4:2. Hence option B is correct. Option A gives the correct unsimplified relationship but not the simplest ratio requested. Option C changes the relative positions of the volumes, and option D falsely makes all three values equal. The reduced ratio preserves the data exactly: for every one volume unit of the first gas, there are four units of the second and two units of the third.

Related tags

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

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