In the case of ${CaCO}_{3} ⇌ CaO + {CO}_{2}$ , attainment of equilibrium state is noticed with the help of constancy

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CaO

Colour

${CaCO}_{3}$

Pressure

answer is C.

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Detailed Solution

Calcium carbonate heated in a closed vessel it starts decomposing to yield CaO & ${CO}_{2}$ gas. ${CO}_{2}$ gas builds up pressure within the vessel. Pressure goes on increasing as the reaction proceeds and finally becomes constant.

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