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What is the correct strategy to solve questions on laws of chemical combination?

Answer and explanation

Correct answer: First identify whether it is about mass ratio, total mass, or gaseous volume

A reliable strategy is to identify what is being compared before selecting a law. If the question compares the masses of one element in two compounds made from the same elements, use multiple proportions. If one pure compound is discussed, a fixed mass composition points to definite proportions. If the question asks whether total mass changes during a reaction, use conservation of mass. If volumes of gases are measured at the same temperature and pressure, consider the law of gaseous volumes. Thus option A is correct because it uses units and wording to identify the governing concept. The other choices apply one rule blindly or ignore essential data.

Related tags

ChemistryChemical Combination LawsProblem Solving StrategyLaws Of Chemical CombinationSome Basic Concepts Of ChemistryClass 11 Mcq

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