Which pair of reaction is an example for law of multiple proportions ?

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$\begin{array}{l} H_{2} + O_{2} \to H_{2} O_{2} \\ H_{2} + S \to H_{2} S \end{array}$

$\begin{array}{l} C + O_{2} \to {CO}_{2} \\ C + \frac{1}{2} O_{2} \to CO \end{array}$

$\begin{array}{l} N_{2} + 2 O_{2} \to N_{2} O_{4} \\ N_{2} + 6 Li \to 2 {Li}_{3} N \end{array}$

$\begin{array}{l} S + O_{2} \underset{Δ}{\to} {SO}_{2} \\ {SO}_{2} + \frac{1}{2} O_{2} \to {SO}_{3} \end{array}$

answer is B.

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Detailed Solution

Law of multiple proportion = when two elements combine to form more than one product, then masses of one element that combine with fixed mass of another element, will always be a simple whole number ratio.

According to the above statement reactants in both the reactions must be same; therefore option ‘2’ is correct.

In option 1, 3 and 4 reactants in both reactions are different, therefore they don’t obey law of multiple proportions.

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