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If A is 70 percent in a pure compound what percent is B?

Answer and explanation

Correct answer: 30 percent

In a pure compound containing only A and B, their percentages add up to 100%. Therefore, percentage of B = 100 - 70 = 30%. The 70% option is the given percentage of A, not that of B. Exam tip: in percentage-composition questions, begin by taking the total composition as 100%.

Related tags

ChemistryChemical CompositionPercentage CompositionPure CompoundLaws Of Chemical CombinationSome Basic Concepts Of ChemistryClass 11 Mcq

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