Chemistry · May / June 2024 · Paper 12 · Question 18
5070Reversible reactions and equilibrium
The reaction between calcium oxide and carbon dioxide is reversible and the forward reaction is exothermic. CaO(s) + CO2(g) ⇌ CaCO3(s) A mixture of calcium oxide and carbon dioxide is placed in a heated flask and the reaction reaches equilibrium. Which statement about this equilibrium is correct?
- ALess calcium carbonate is produced if the pressure in the flask increases.
- BMore calcium carbonate is produced when the temperature is increased.
- CThe flask must be sealed if equilibrium is to be reached.
- DWhen equilibrium is reached, the reaction stops.
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Correct answer: C. The flask must be sealed if equilibrium is to be reached.
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