Which one of the following pair of substances illustrate the law of multiple proportions?

KCl and KBr

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SO₂ and SO₃

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BaO and Ba(OH)₂

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H₂ and D₂

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Solution

The correct option is B
SO₂ and SO₃

The law of multiple proportion states that, ''If two elements can combine to form more than one compound, the masses of one element that combine with a fixed mass of the other element, are in the ratio of small whole numbers.''

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