Question

Why do mixtures never possess a fixed melting point or a fixed boiling point? Give reason.

Answer 1

Boiling point: The temperature at which a liquid gets converted into its corresponding vapor at normal atmospheric pressure.

Melting point: The temperature at which a solid gets converted into its liquid state at normal atmospheric pressure.

Mixtures do not have fixed melting and boiling points because:

• A mixture is a combination of two or more substances in which the constituents do not lose their identities.
• The mixture consists of many solutes present in variable proportions which have different melting and boiling points.

Therefore, a mixture does not have fixed melting and boiling point.