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A student used two samples of the same compound for multiple proportions. What is the correct correction?

Answer and explanation

Correct answer: Different compounds of the same two elements are needed for multiple proportions

The direct answer is option A: different compounds made from the same two elements are needed. The law of multiple proportions compares two or more compounds containing the same pair of elements. A fixed mass of one element combines with different masses of the second element, and those masses show a simple whole-number ratio. Two samples of the same compound do not create this comparison; they should have the same composition and therefore illustrate definite proportions instead. Option A gives the correct correction. Option B, one compound is enough, is wrong because one compound cannot show how the elements combine differently in another compound. Option C, a mixture, is wrong because a mixture is not a single compound with a fixed chemical composition. Option D, only gas volumes, describes the type of data used for gaseous-volume law, not multiple proportions. The logical steps are: identify the same two elements, find at least two distinct compounds, fix one element's mass, compare the other element's masses, and simplify the ratio. Memory cue: one pure compound means definite proportions; different compounds of the same two elements means multiple proportions.

Related tags

Chemistry Laws Chemical CombinationLaws Of Chemical CombinationSome Basic Concepts Of ChemistryChemistryClass 11 Mcq

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