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Reaction Quotient

The reactions...

Question

The reactions,
$P C l_{5} (g) ⇌ P C l_{3} (g) + C l_{2} (g)$ and
$C O C l_{2} (g) ⇌ C O (g) + C l_{2} (g)$
are simultaneously in equilibrium in a vessel at a constant volume. If some $C O$ is introduced into the vessel then at the new equilibrium, the concentration of:

A

P C l_{5}

is increased

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B

P C l_{3}

remains unchanged

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C

P C l_{5}

is decreased

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D

C l_{2}

is increased

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Solution

The correct option is C $P C l_{5}$ is decreased
When $C O$ is added to the above system, the second reaction will go backwards in accordance with Le Chatelier's principle and hence, the concentration of the common molecule i.e., $C l_{2}$ will also reduce.
So, to counteract the decreased concentration of chlorine, the first equilibrium will go forward and hence, the concentration of $P C l_{5}$ will decrease.

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