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Question: Answered & Verified by Expert
Consider reaction,

CaCO 3 s CaO s + CO 2 g

In a closed container at equilibrium. What would be the effect of addition of CaCO 3 on the equilibrium concentration of CO 2 ?
ChemistryChemical EquilibriumJEE Main
Options:
  • A Increases
  • B Decreases
  • C Data is not sufficient to predict it 
  • D Remains unaffected 
Solution:
2292 Upvotes Verified Answer
The correct answer is: Remains unaffected 
This is a heterogeneous equilibrium. The equilibrium constant for it can be written as:

K c = CO 2

The concentration of CaCO3 and CaO are assumed to be constant as they are present as solid.

Hence, CaCO3 has no effect on equilibrium concentration.

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