O-LevelChemistryAtomic Structure5070/11 · May/June 2011 · Q21 Mark
A drop of liquid bromine is placed in the bottom of a gas jar. Brown fumes of bromine vapour slowly spread through the covered gas jar. Why does this happen?
ABromine vapour is less dense than air.
BBromine molecules and the molecules in air are always moving around.
CBromine molecules are smaller than the molecules in air.
DBromine molecules move faster than the molecules in air.
✓ Correct answer
B: Bromine molecules and the molecules in air are always moving around.
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