Question

The diagram shows the melting and boiling points of four different substances. Which substance has a freezing point at ${40}^{\circ }C$?Identify a temperature range at which substances B and D can co-exist in liquid state?

Answer 1

Boiling point is come from solid to liquid transition and freezing point is come from liquid to solid transition of a material. Generally, the freezing point is same as the boiling point. Thus, from the diagram, the substance B has freezing point or boiling point at ${40}^{o}C$ and the temperature range ${60}^{o}C$ to ${160}^{o}C$ at which the substances B and D can co-exit in liquid state.