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Question

In the following equilibrium reaction involving the dissociation of CaCO3, the equilibrium constant is given by:
CaCO2(s)CaO(s)+CO2(g)

A
PCaO×PCO2PCaCP3
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B
CCaO×PCO2CCaCO3
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C
PCaOPCaCO3
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D
PCO2
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Solution

The correct option is D PCO2
The equilibrium reaction is:
CaCO3(s)CaOs+CO2(g)
The expression for the equilibrium constant is Kp=[PCaO][PCO2][PCaCO3]
The pressure of solids are considered as unity.
Substitute [PCaCO3]=1 and [PCaO]=1 in the expression for the equilibrium constant.
Kp=[PCO2]

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