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In pure (BaSO_4) the ratio of barium sulfur and oxygen is always fixed. This is an example of which law?

Answer and explanation

Correct answer: Definite proportions

The direct answer is A: the law of definite proportions. This law says that a pure compound always contains the same elements combined in a fixed proportion by mass. Pure barium sulfate, written as \\(BaSO_4\\), contains barium, sulfur, and oxygen joined in a definite composition. A sample taken from any source will have the same mass relationship among these elements if it is pure barium sulfate. Option A is correct because the clue is “pure compound” and “always fixed.” Option B, the law of multiple proportions, applies when two elements form more than one compound and their masses combine in simple whole-number ratios; that situation is not described here. Option C, the law of gaseous volumes, deals with combining volumes of gases under suitable conditions. Option D, reciprocal proportions, compares the combining masses of elements in different compounds and is not the direct idea in this statement. The safest exam clue is fixed composition of one pure compound. Remember: one pure compound plus fixed element ratio means definite proportions.

Related tags

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

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