Which of the following represents a hydrogen displacement reaction?
◦ 2C2H6(g) + 7O2(g) → 4CO2(g) + 6H2O(l)
◦ 2KBr(aq) + Cl2(g) → 2KCl(aq) + Br2(l)
◦ N2(g) + 3H2(g) → 2NH3(g)
◦ CaBr2(aq) + H2SO4(aq) → CaSO4(s) + 2HBr(g)
◦ 2Al(s) + 3H2SO4(aq) → Al2(SO4)3(aq) + 3H2(g)