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

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$Sulphur \ dioxide$ $(SO_2)$ and $sulphur \ trioxide$ $(SO_3)$

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(D) The law of multiple proportions states that when two elements combine to form more than one compound,the masses of one element that combine with a fixed mass of the other are in the ratio of small whole numbers.In the case of $SO_2$ and $SO_3$,the element $sulphur$ $(S)$ combines with $oxygen$ $(O)$.For a fixed mass of $S$ $(32 \ g)$,the mass of $O$ in $SO_2$ is $32 \ g$ and in $SO_3$ is $48 \ g$.The ratio of the masses of $oxygen$ is $32:48$,which simplifies to $2:3$,a simple whole number ratio.

The law of multiple proportions is illustrated by the two compounds:

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