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In two compounds, a fixed mass of 15 g of A combines with 12 g and 48 g of B, respectively. What is the simplest ratio of the masses of B?

Answer and explanation

Correct answer: 1:4

This question applies the law of multiple proportions. The mass of A is fixed at 15 g in both compounds, so the comparison must be made between the corresponding masses of B only. Their ratio, in the order stated, is 12:48. The greatest common divisor is 12; dividing both terms by 12 gives 12/12 : 48/12 = 1:4. Hence option C is correct. Option D repeats the unsimplified data. Option B compares the fixed mass of A with a mass of B, which is not the required comparison. Option A reverses the order and gives 4:1. The constant mass of A establishes the condition for applying the law but does not appear in the final B-to-B ratio.

Related tags

ChemistryLaw Of Multiple ProportionsRatio CalculationLaws Of Chemical CombinationClass 11 ChemistrySome Basic Concepts Of ChemistryClass 11 Mcq

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