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Each of the mixtures listed below was pl...

Each of the mixtures listed below was placed in a closed container and allowed to stand. Which of the following mixtures is not capable of attaining the equilibrium: `CaCO_3(s) Leftrightarrow CaO(s)+CO_2(g)?`
(a) Pure `CaCO_3`
(b) CaO and a pressure of `CO_2` greater than `K_p`
(c) Some `CaCO_3` and a pressure of `CO_2` greater than `K_p`
(d) `CaCO_3` and Co

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The correct Answer is:
C
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