For CaCO₃(S) ⇌ CaO(S)+CO₂(g), H= +Q at equilibrium, to shift equilibrium towards right,

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Temperature should be decreased

[CO₂] should be increased.

Pressure should be increased

[CO₂] should be decreased.

answer is B.

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Detailed Solution

The reaction, CaCO₃(s)⇌ CaO(s)+CO₂(g), H= +Q ,

According to Le-principle, Chatelier's a higher concentration of gaseous reactants favors reaction, which results in a lower concentration of gaseous products.

Therefore, the correct answer is option (B) [CO₂] should be decreased.

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