Problem: Which of the following represents a heterogeneous equilibrium? N2O4 (g) ⇌  2 NO2 (g) CH3COOH (aq)  +  H2O (l)  ⇌ CH3COO­­­­- (aq)  +  H3O+ (aq) CaCO3 (s) ⇌ CaO (s) +  CO2 (g) NH3 (aq)  +  H2O (l)  ⇌ NH4+ (aq) +  OH­­­­- (aq) None of the above.   

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Which of the following represents a heterogeneous equilibrium?

  1. N2O4 (g) ⇌  2 NO2 (g)
  2. CH3COOH (aq)  +  H2O (l)  ⇌ CH3COO­­­­- (aq)  +  H3O+ (aq)
  3. CaCO3 (s) ⇌ CaO (s) +  CO2 (g)
  4. NH3 (aq)  +  H2O (l)  ⇌ NH4+ (aq) +  OH­­­­- (aq)
  5. None of the above. 

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