Question

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$H_{2}O,H_{2}S$ and $S{O}_2$ follow the Law of reciprocal properties.

Answer 1

In $H_{2}O$, the ratio of masses of H and O is $2:16$.
In $S{O}_2$ , the ratio of masses of S and O is $32:32$.
Therefore, the ratio of masses of H and S which combine with a fixed mass of oxygen (say $32$ parts) will be $4:32$ i.e., $1:8$.
When H and S combine together, they form $H_{2}S$ in which the ratio of masses of H and S is $2:32$ i.e., $1:1$6 .
The two ratios (i) and (ii) are related to each other as $2:1$, i.e., they are whole number multiple of each other. Thus, the ratio of masses of H and S which combines with a fixed mass of oxygen is a whole number multiple of the ratio in which H and S combine together.