Explanation

(d)
In $CS_{2}$
C : S mass ratio is 15.79 : 84.21
15.79 parts of carbon combine with sulphur = 84.21
$\therefore$ 27.27 parts of carbon will combine with
$S = \frac{84.21}{15.79} \times 27.27 = 145.434$
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Hence, ratio of $S:O$ is 145.434:72.73 $ie,$ 2 : 1
In $SO_{2},$ the ratio of $S:O$ is 1 : 1
Since, the ratio of $S:O$ is a simple whole number ratio,
Therefore law of reciprocal proportions is proved.