Dear Student,
A homegeneous equilibria is the one in which the reactants and product in the equilibrium mixture are in the same phase.
C2H2(aq) + 2Br2(aq) ↔ C2H2Br4(aq)
A hetrogeneous equilibria is the one in which reactants and products prsent in the equilibrium micture are in more than 1 phase.
Br2(l) ↔ Br2(g)
Regards.