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Question

Consider the reaction, PCl5(g)PCl3(g)+Cl2(g) in a closed container at equilibrium at a fixed temperature. What will be the effect of adding more PCl5 on the equilibrium concentration of Cl2(g) ?

A
it decreases
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B
it increases
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C
it remains unaffected
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D
it cannot be predicted without the value of Kp.
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Solution

The correct option is B it increases
Given reaction,
PCl5(g)PCl3(g)+Cl2(g)
When we add PCl5 to the equilibrium mixture at constant temperature in closed vessel its concentration will increase.
By Le Chatelier's principle, to nullify the effect the equilibrium is shifted to right so that more PCl5 is consumed and the effect is nullified. Due to equilibrium shift to right hand side, the product concentration will increase. Hence, the equilibrium concentration of Cl2 increases

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