Question

Chlorine gas is to be heated from 120°C. What will be the change in its physical state?

A. It will remain a gas
B. It will condense into a liquid
C. It will freeze into a solid
D. It will undergo sublimation into a gas

Answer 1

Chlorine gas will undergo sublimation into a gas when heated from 120°C.

Step-by-step explanation:

The change in physical state of chlorine gas when heated from 120°C depends on its boiling point and the temperature at which it exists as a gas. Chlorine gas has a boiling point of -34°C. When heated from 120°C, which is higher than its boiling point, chlorine gas will undergo sublimation into a gas. Sublimation is the phase change where a solid goes directly to a gas without passing through the liquid phase.

For example, when dry ice (solid carbon dioxide) is heated, it undergoes sublimation and transforms directly into a gas without becoming a liquid.