Question

Carbon forms two oxides in which percentage of carbon is 42.9% and 27.3% respectively.
Above data illustrates:

• A. Law of mass conservation.
• B. Law of constant proportion
• C. Law of reciprocal proportion
• D. Law of multiple proportion

Answer 1

The correct option is D Law of multiple proportion

In compound $1$.

There are $57.1g$ of $O$ and $42.9g$ of $C.$

The mass of $O$ per gram $C$ is $\frac{57.1}{42.9}=1.33g$ $O$ per gram of $C⟶\left(i\right)$

In compound $2$,

There are $72.7g$ of $O$ and $27.3g$ of $C$.

$\therefore$ The mass of $O$ per gram of $C=\frac{2.66}{1.33}=2g$ $O$ per gram of $C⟶\left(ii\right)$

$\frac{2}{1}=\frac{2}{1}$

i.e. The masses of oxygen that combine with carbon are in a $2:1$ ratio.

The data illustrates the law of multiple proportion.