JAMB Chemistry 2023 Paper

Concept:The state of a substance at room temperature depends on its physical properties, such as boiling point.Explanation:Chlorine exists as diatomic molecules, $\mathrm{Cl}_2$.Its boiling point is about $-34^\circ\mathrm{C}$, which is far below room temperature ($25^\circ\mathrm{C}$ or $298\ \mathrm{K}$).Since room temperature is much higher than its boiling point, chlorine cannot remain as a liquid or solid.At standard pressure ($1\ \mathrm{atm}$) and room temperature, chlorine therefore exists as a gas.Answer:D. Gas