Which one of the following liberates oxygen immediately when passed into water?
Which one of the following liberates oxygen immediately when passed into water?
$\mathrm{F}_2$
$\mathrm{Cl}_2$
$\mathrm{Br}_2$
$\mathrm{I}_2$
Solution
Due to its high reactivity fluoride reacts with water to produce $\mathrm{O}_2$.
$
2 \mathrm{~F}_2(g)+2 \mathrm{H}_2 \mathrm{O}(l) \longrightarrow \mathrm{O}_2(g)+4 \mathrm{HF}(a q)
$