Which set of compounds illustrates the Law of Multiple Proportions?

Name: Which set of compounds illustrates the Law of Multiple Proportions?
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Question

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The Law of Multiple Proportions states that when two elements form a series of compounds, the ratios of the masses of the second element that combine with a fixed mass of the first element are always ratios of small whole numbers. Choice C (NH3, N2H4) illustrates this law, as both compounds are formed by nitrogen and hydrogen in different ratios.

Which Set of Compounds Illustrates the Law of Multiple Proportions