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At the same temperature and pressure gas volumes are 15 litres 25 litres and 5 litres. What is the simplest ratio?

Answer and explanation

Correct answer: 3:5:1

The direct answer is B: 3:5:1. Keep the order of the volumes: 15:25:5. The greatest common divisor is 5. Divide each term by 5: 15 ÷ 5 = 3, 25 ÷ 5 = 5, and 5 ÷ 5 = 1. Hence the simplest ratio is 3:5:1. Option A is the original ratio and is not simplified. Option B is correct because all three terms were divided by the same common factor and the result has no common factor greater than 1. Option C, 1:5:3, changes the first and third positions and does not match the data. Option D, 1:2:3, also gives different relative values. The fact that the gases are at the same temperature and pressure allows their volumes to be compared directly, but it does not require a special gas-law calculation here. Exam reminder: preserve order and divide every term equally.

Related tags

ChemistryLaws-Of-Chemical-CombinationClass-11

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