Question

# For the reaction PCl5(g)⇌PCl3(g)+Cl2(g), the forward reaction at constant temperature is favoured by

A
Introducing an inert gas at constant volume

B
Introducing chlorine gas at constant volume

C
Introducing an inert gas at constant pressure

D
All of the above

Solution

## The correct option is B Introducing an inert gas at constant pressure   As per Le-Chatelier principle, a) Addition of inert gases at constant volume increases the total pressure. However, it does not affect the partial pressures of the reactants and products.  b) Addition of gaseous products will only favor backward reaction. c) Addition of inert gases at constant pressure will favor the side that has more number of moles because of the decrease in partial pressures of the products and reactants upon addition of inert gases.Hence the forward reaction is more favored.

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