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In two compounds 4 grams element A combines with 9 grams and 27 grams B. What is the ratio of B?

Answer and explanation

Correct answer: 1:3

The mass of element A is the same in both compounds, i.e. 4 g. Therefore, the ratio of the masses of B is 9:27. Dividing both terms by 9 gives 1:3. The ratio 1:2 is incorrect because 27 g is three times 9 g, not twice. Exam tip: identify the element with fixed mass and reduce the masses of the other element to their simplest ratio.

Related tags

ChemistryChemical CombinationMultiple ProportionsMass RatioClass 11Laws Of Chemical CombinationSome Basic Concepts Of ChemistryClass 11 Mcq

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