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MgCO3(s) ⇌ MgO(s) + CO2(g). MgO & MgCO3 are solid and they do not exert any pressure and hence only pressure exerted is by CO2. Therefore Kp = PCO2.

1. Kp = PCO2
2. Kp = PCO2 / PCH4
3. Kp = PCO2 × PCH4
4. Kp = PCO2 / [PO2]

Correct answer: Kp = PCO2

Solution

In this equilibrium, only CO2 is in the gaseous state and contributes to the equilibrium pressure. Solids like MgCO3 and MgO do not appear in the expression for Kp.

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