Which of the following pairs of compounds can be used to illustrate Dalton's Law of Multiple Proportions?

N H_{4}

and

N H_{4} C l

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S O_{2}

and

S O_{3}

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H_{2}

and

O_{2}

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H_{2} O

and

H C l

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Solution

The correct option is B $S O_{2}$ and $S O_{3}$
Law of Multiple proportions states that if two elements form more than one compound between them, then the ratios of masses of second element which combine with a fixed mass of first element ratios of small whole numbers.
$*$ Ex: 1) $C O, C O_{2}$ 2) $S O_{2}, S O_{3}$ 3) $C u O, C u_{2} O$ etc.

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