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  4. The equilibrium will be shifted in the opposite direction if: P C l3(g)+C l2(g) P C l5(g)

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Q. The equilibrium will be shifted in the opposite direction if: $P C l_{3}(g)+C l_{2}(g) P C l_{5}(g)$

J & K CETJ & K CET 2000

Solution:

$\underset{1 \text { mole }}{ PCl _{3}(g)}+\underset{1 \text { mole }}{ Cl _{2}(g)} \underset{1 \text { mole }}{ PCl _{5}(g)}$
In the backward reaction number of moles increases, hence, decreasing pressure will favour the backward reaction.