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Question

For the reaction: PCl5(g) PCl3(g)+Cl2(g), the forward reaction is favoured by:


A
Introducing an inert gas at a constant volume
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B
Introducing chlorine gas at a constant volume
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C
Introducing an inert gas at a constant pressure
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D
Increasing the volume of the container
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Solution

The correct options are
C Introducing an inert gas at a constant pressure
D Increasing the volume of the container
Introducing an inert gas at a constant pressure will change the partial pressure of all reactants since the total volume increases. This would increase the rate of forward reaction if Δ n>0 and will favour the backward reaction if  Δ n<0, where  Δ n= moles of product moles of reactants.
Increasing the volume of the container reduces the pressure inside the container which shifts the equilibrium in a direction where the number of moles increases.

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