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At the same temperature and pressure gas volumes are 20 litres 30 litres and 10 litres. What is the simplest ratio?

Answer and explanation

Correct answer: 2:3:1

The direct answer is B: 2:3:1. Preserve the order of the given volumes, so start with 20:30:10. Their greatest common divisor is 10. Divide all three terms by 10: 20 ÷ 10 = 2, 30 ÷ 10 = 3, and 10 ÷ 10 = 1. The simplest ratio is therefore 2:3:1. Option A is the original ratio and has not been reduced. Option B is correct because every term has been divided by the same factor and no further common divisor greater than 1 remains. Option C, 1:3:2, changes the relationships between the quantities. Option D, 1:2:3, also reverses the size pattern and cannot be obtained by one common division. The units cancel in a ratio, but the order must remain fixed. Exam tip: check both simplification and order.

Related tags

ChemistryLaws-Of-Chemical-CombinationClass-11

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