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(D) The law of multiple proportions states that when two elements combine to form two or more compounds,the masses of one element that combine with a

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$Na_2S, NaF$

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(D) The law of multiple proportions states that when two elements combine to form two or more compounds,the masses of one element that combine with a fixed mass of the other are in the ratio of small whole numbers.This law is applicable only when the same two elements form different compounds.In the pair $Na_2S$ and $NaF$,the elements involved are different ($S$ and $F$),so they cannot demonstrate the law of multiple proportions.

Which of the following pairs of compounds cannot demonstrate the law of multiple proportions?

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