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NEET levelSingle correct optionDifficulty 1 of 3ce062

For $CaCO X_{3} (s) CaO (s) + CO X_{2} (g)$ at a fixed temperature, the expression for $K_{p}$ is

A $K_{p} = \frac{p _{CaO} p _{CO X_{2}}}{p _{CaCO X_{3}}}$
B $K_{p} = p_{CaO} p_{CO X_{2}}$
C $K_{p} = \frac{p _{CO X_{2}}}{p _{CaCO X_{3}}}$
D $K_{p} = p_{CO X_{2}}$

Answer: D

Pure solids have constant activity (taken as 1) and do not appear in the equilibrium expression. Only the gas remains, so

K_{p} = p_{CO X_{2}}

.

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