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

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Sodium chloride and sodium bromide

Ordinary water and heavy water

Caustic soda and caustic potash

Sulphur dioxide and sulphur trioxide

answer is D.

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Detailed Solution

When two different elements combines to form two or more compounds, the weight of of one element combined with fixed weight of the other are in the ratio of small whole numbers.

Weight of oxygen combining with 1 gm (fixed) Sulphur is

$\frac{32}{32} : \frac{48}{32} = 2 : 3$

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