Q19 of 54 Page 86

In which of the following reactions, the Equilibrium remains unaffected on the addition of a small amount of argon at constant volume?

• The disturbance or the change in an Equilibrium occurs only when 1.) the partial pressures or 2.) the molar concentrations of the participants changes during the reaction.


• Adding inert gas while keeping the volume constant does not affect the Equilibrium because it cannot change either of the above-mentioned no.1.) or no.2.) major factors as it is not taking part in the reaction.


Hence for each cases of (i) H2 (g) + I2 (g) ⇋ 2HI (g)


(ii) PCI5 (g) ⇋ PCI3 (g) + CI2 (g)


(iii) N2 (g) +3H2 (g) ⇋ 2NH3 (g) the Equilibrium will remain unaffected on addition of Argon which is an inert gas.


Hence (iv) is the correct answer.

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