Explain homogeneous and heterogeneous equilibrium giving examples

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If all the reactants and products present in an equilibrium mixture are in same 

phase → homogeneous equilibrium. 

Example: N2(g) + 3H2(g)  ⇌ 2NH3(g)

If all the reactants and products present in an equilibrium mixture are indifferent phase → heterogeneous equilibrium. 

Example: CaCO3 (s) ⇌ CaO(s) + CO2(g)

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