Question

Give reason for the following:
Red brown vapours are produced when concentrated sulphuric acid is added to hydrogen bromide.

Answer 1

When hydrogen bromide reacts with sulphuric acid the bromine gas is obtained which produce red brown vapours.
2KBr + 3H₂SO₄ → 2KHSO₄ + SO₂ + Br₂ ↑ + 2H₂O