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A student chose two samples of the same H₂O for applying the law of multiple proportions. What is the correct correction?

Answer and explanation

Correct answer: Different compounds made from the same two elements are needed

The governing concept is the law of multiple proportions. This law applies when the same two elements form two or more different compounds. If a fixed mass of one element combines with different masses of the other element, those masses show a simple whole-number ratio. For example, carbon and oxygen form CO and CO₂; for the same mass of carbon, the oxygen masses combine in a 1:2 ratio. Two samples of H₂O are still samples of the same compound, so they cannot demonstrate multiple proportions. A mixture is also unsuitable because its composition is variable rather than fixed. Hence option A is correct: compounds formed from the same two elements, but having different compositions, must be compared. Options B, C and D do not state the required condition.

Related tags

ChemistryLaws-Of-Chemical-CombinationClass-11Laws Of Chemical CombinationSome Basic Concepts Of ChemistryClass 11 Mcq

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