Which of the following represents a hydrogen displacement reaction?
O 2Al(s) + 3H₂SO₄ (aq) → Al2(SO₄)₃(aq) + 3H₂(g)
O 2KBr(aq) + Cl₂(g) → 2KCl(aq) + Brz(l)
O 2C₂H(g) + 7O₂(g) → 4CO₂(g) + 6H₂O(l)
O CaBr₂(aq) + H₂SO₄(aq) → CaSO₄ (s) + 2HBr(g)
O N₂(g) + 3H₂(g) → 2NH₃(g)
