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At the same temperature and pressure gas volumes are 14 litres 7 litres and 21 litres. What is the simplest ratio?

Answer and explanation

Correct answer: 2:1:3

The direct answer is C: 2:1:3. A ratio compares quantities in the order in which they are given. The volumes are 14 L, 7 L and 21 L, so begin with 14:7:21. To obtain the simplest ratio, divide every term by their greatest common divisor, 7: 14 ÷ 7 = 2, 7 ÷ 7 = 1, and 21 ÷ 7 = 3. Thus the ratio is 2:1:3. Option A is the unsimplified ratio, so it is numerically equivalent but not the simplest form. Option B changes the values incorrectly and gives 3:1:2. Option C follows the calculation exactly. Option D reverses the order and gives 1:2:3, which does not match the original order. Exam cue: divide every term by the same greatest common factor.

Related tags

ChemistryLaws-Of-Chemical-CombinationClass-11

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