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In two compounds, a fixed mass of 30 g of A combines with 24 g and 96 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 kept constant at 30 g in both compounds, so the relevant comparison is between the two masses of B, namely 24 g and 96 g. Their ratio in the stated order is 24:96. The greatest common divisor of these two numbers is 24, so divide each term by 24: 24 ÷ 24 : 96 ÷ 24 = 1:4. Thus option B is correct. Option D shows the correct initial data but leaves the ratio unreduced. Option C compares the fixed mass of A with one mass of B, which is not what is asked. Option A reverses the order and gives 4:1 instead of 1:4.

Related tags

ChemistryLaws Of Chemical CombinationLaw Of Multiple ProportionsRatio SimplificationSome Basic Concepts Of ChemistryClass 11 Mcq

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