${CaCO}_{3} ⇌ CaO + {CO}_{2}$ reaction in a lime kiln goes to completion because

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It is a heterogeneous reaction

Backward reaction is very slow

${CO}_{2}$ formed escapes out

$K_{C}$ (or) $K_{p}$ has no unit

answer is C.

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Detailed Solution

Limekiln is an open vessel. In limekiln, the reaction ${CaCO}_{3} ⇋ CaO +$ ${CO}_{2} (g)$ is irreversible. The carbon dioxide gas escapes in the atmosphere. Hence, only forward reaction occurs. The reaction continues to occur until all calcium carbonate is exhausted.

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