RRB ALP CBT I 26 Nov 2024 Shift 1 Paper

Concept:Most non-metals exist as gases or solids at room temperature, but bromine is the only non-metal that remains liquid.Explanation:At room temperature, bromine is a volatile red-brown liquid.It is a halogen placed in group $17$ of the periodic table.Its chemical symbol is $\mathrm{Br}$ and its atomic number is $35$.Bromine gives off a brownish vapour at room temperature and is highly reactive.It can cause burns on skin contact, so it must be handled carefully.Let us compare the other options.Chlorine ($\mathrm{Cl}_2$) is a greenish-yellow gas at room temperature and is used for water purification.Fluorine ($\mathrm{F}_2$) is a pale yellow gas and is the most reactive non-metal.Sulphur ($\mathrm{S}$) is a bright yellow solid at room temperature.Thus, among the given non-metals, bromine is the only liquid.Answer:Option B: Bromine.