JAMB Chemistry 2023 Paper

Concept:Halogens have different physical states and colours at room temperature.Explanation:The halogens include fluorine ($\mathrm{F}$), chlorine ($\mathrm{Cl}$), bromine ($\mathrm{Br}$), and iodine ($\mathrm{I}$).At room temperature, fluorine and chlorine are gases, while bromine is a liquid and iodine is a solid.Chlorine is greenish-yellow in colour, but fluorine is pale yellow.Therefore, the halogen that is a gas at room temperature and pale yellow is fluorine.Answer:B. Fluorine ($\mathrm{F}$)