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NEET levelSingle correct optionDifficulty 1 of 3ce113

For $CaCO X_{3} (s) CaO (s) + CO X_{2} (g)$ , $K_{p} = 0.5$ atm at a certain temperature. A closed vessel containing solid $CaCO X_{3}$ and solid $CaO$ has $p_{CO X_{2}} = 0.2$ atm. What happens?

A $CaCO X_{3}$ decomposes further until $p_{CO X_{2}} = 0.50$ atm
B $CO X_{2}$ combines with $CaO$ until $p_{CO X_{2}} = 0.50$ atm
CThe system is at equilibrium
DNothing happens because both substances on one side are solids

Answer: A

Solids do not appear in the quotient, so

Q_{p} = p_{CO X_{2}} = 0.2

atm. Since

Q_{p} < K_{p} = 0.5

atm, the reaction goes forward and

CaCO X_{3}

decomposes, raising

p_{CO X_{2}}

to

K_{p}

.

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