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In two compounds, a fixed mass of 18 g of A combines with 21 g and 63 g of B, respectively. What is the simplest ratio of the masses of B?

Answer and explanation

Correct answer: 1:3

The relevant concept is the law of multiple proportions. Since the mass of A is unchanged at 18 g in both compounds, it serves as the fixed reference and should not be included in the final comparison. Compare the masses of B in the stated order: 21:63. Their greatest common divisor is 21, so divide each term by 21: 21/21 : 63/21 = 1:3. Thus option A is correct. Option D gives the correct unsimplified data, not the simplest ratio. Option C mixes A's mass with B's mass and is therefore irrelevant. Option B reverses the order, representing 63:21 rather than the required 21:63.

Related tags

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

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