Question

Which of the following obeys the law of constant proportions in their formation?

• A. Mixtures
• B. Compounds
• C. Elements
• D. Colloids

Answer 1

The correct option is B Compounds

The Law of constant proportion is the rule where elements combine in a fixed proportion by mass.

Thus compounds are the kind that is formed from a fixed proportion of elements.

For example, Water $\to H_{2}O$ is obtained from any source of water like a river, lake, pond. Here the ratio of $H$ and $O$ will be always $2:1$.

Hence, option B is correct.