CaCO3(s) iff CaO(s) + CO2(g) in closed c...

`CaCO_3(s) iff CaO(s) + CO_2(g)` in closed container at equilibrium. What would be the effect of addition of `CaCO_3` on the equilibrium concentration of `CO_2` :

Increases

Remains unaffected

Decreases

Data is not sufficient

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