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In the equilibrium reaction CaCO3(s) ⇌ CaO(s) + CO2(g) whose concentration remains constant at a given temperature? 

(a) CaO 

(b) CO2 

(c) CaCO3 

(d) Both (a) and (c)

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(d) Both (a) and (c)

Concentration of solids remains constant at a particular temperature.

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