The reaction $C a C O_{3} (g) ⇌ C a O (g) + C O_{2} (g)$ proceeds to completion if ....

C O

escapes

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C O_{2}

escapes

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carbonates

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no option

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Solution

The correct option is B $C O_{2}$ escapes
The reaction $C a C O_{3} (g) ⇌ C a O (g) + C O_{2} (g)$ proceeds to completion if $C O_{2}$ escapes.
As carbon dioxide escapes, its concentration decreases. So the equilibrium will shift in the forward direction so that more and more carbon dioxide is formed to nullify the effect of decrease in the carbon dioxide concentration.

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