Observe the following equilibrium at $\mathrm{T}(\mathrm{K})$…
Observe the following equilibrium at $\mathrm{T}(\mathrm{K})$
$\mathrm{H}_2(\mathrm{~g})+\mathrm{I}_2(\mathrm{~g}) ightleftharpoons 2 \mathrm{HI}(\mathrm{g})$
Which one of the following does not disturb the above equilibrium?
Addition of $\mathrm{H}_2$ (g)
Removal of $\mathrm{HI}(\mathrm{g})$
Addition of $\mathrm{I}_2(\mathrm{~g})$
Addition of $\mathrm{He}(\mathrm{g})$
Solution
Addition of $\mathrm{He}$ gas (inert gas) at constant pressure or volume will not have any effect on the equilibrium of the given reaction as a change of pressure will not affect the number of gaseous moles that are equal on reactant and product side.
^