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A pure compound contains 40 percent A and 60 percent B. What is the ratio A:B?

Answer and explanation

Correct answer: 2:3

The mass percentages of A and B are 40 and 60 respectively, so their ratio is 40:60. Dividing both terms by 20 gives 2:3. The ratio 3:2 is the reverse ratio, so it is incorrect. Exam tip: write the percentages directly as a ratio and simplify it using a common factor.

Related tags

ChemistryChemical CombinationPercentage CompositionMass RatioPure CompoundsLaws Of Chemical CombinationSome Basic Concepts Of ChemistryClass 11 Mcq

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