In which of the following reactions at equilibria, the position of the equilibrium shifts towards the…
In which of the following reactions at equilibria, the position of the equilibrium shifts towards the products, if
the total pressure is increased?
(i) $\mathrm{X}_2(\mathrm{~g})+3 \mathrm{Y}_2(\mathrm{~g}) ightleftharpoons 2 \mathrm{XY}_3(\mathrm{~g})$
(ii) $\mathrm{X}_2(\mathrm{~g})+\mathrm{Y}_2(\mathrm{~g}) ightleftharpoons 2 \mathrm{XY}(\mathrm{g})$
(iii) $\mathrm{X}_2(\mathrm{~g})+\mathrm{Z}_2(\mathrm{~g}) ightleftharpoons 2 \mathrm{XZ}(\mathrm{g})$
(iv) $\mathrm{X}_2(\mathrm{~g})+\mathrm{Y}_4(\mathrm{~g}) ightleftharpoons 2 \mathrm{XY}_2(\mathrm{~g})$
(ii)
(iii)
(i)
(iv)
Solution
According to Le-chatelier's principle; on increasing the pressure, equilibrium shifts towards that direction where number of gaseous moles are minimum. In reaction (i) no. of moles in product side is less. Hence, on increasing pressure, equilibrium shift towards product side.