Question

Elements A and B combine to form three different compounds:
$0.3$ g of A $+0.4$ g of B $\to$ $0.7$ g of compound X
$18.0$ g of A $+48.0$ g of B $\to$ $66.0$ g of compound Y
$40.0$ g of A $+159.99$ g of B $\to$ $199.99$ g of compound Z
State the law illustrated by these chemical combinations.

• A. Law of reciprocal proportion
• B. Law of multiple proportion
• C. Law of constant composition
• D. None of the above

Answer 1

The correct option is B Law of multiple proportion

Weights of B that combine with $1.0$ g of A in the compounds X, Y and Z are, respectively,
$\frac{0.4}{0.3}=1.33,\frac{48.0}{18.0}=2.66$ and $\frac{159.99}{40.0}=4.00$
Ratio being $1.33:2.66:4.00$ or $1:2:3$ is the simple ratio and this illustrates the law of multiple proportions.