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Calcium oxide and carbon dioxide combine to form calcium carbonate in the reversible reaction:

CaO + CO2 ⇌ CaCO3

When the reaction is at dynamic equilibrium, which statement must be true?
The reaction has run out of carbon dioxide or calcium oxide.

Calcium carbonate and calcium oxide are formed at the same rate.

The concentration of calcium carbonate is increasing.

The forward and reverse reactions have stopped.
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