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Which law compares the different compounds \(PCl_3\) and \(PCl_5\) made from phosphorus and chlorine?

Answer and explanation

Correct answer: Law of multiple proportions

The law of multiple proportions describes the relationship between different compounds formed by the same two elements. When the mass of one element is kept constant, the masses of the other element that combine with it form a simple whole-number ratio. This law helps distinguish several compounds containing the same elements.

Phosphorus and chlorine form \(PCl_3\) and \(PCl_5\). For the same amount of phosphorus, the chlorine amounts are proportional to 3 and 5, giving the simple ratio \(3:5\). Therefore, their comparison is an example of the law of multiple proportions. Option D is correct. The definite-proportions law would describe the fixed composition within one selected compound.

Related tags

ChemistryLaws-Of-Chemical-CombinationClass-11

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