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In which case following equilibrium can't be established:

CaCO3(s) CaO(s) + CO2(g)

1. Some CaO & pressure of CO2 was greater than Kp

2. Pure CaCO3

3. Some CaCO3 & pressure of CO2 gas greater than Kp

4. Some CaCO3 & pressure of CO2 gas less than Kp.