In the following system, $\mathrm{PCl}_5(\mathrm{~g}) \rightleftharpoons…

In the following system, $\mathrm{PCl}_5(\mathrm{~g}) \rightleftharpoons \mathrm{PCl}_3(\mathrm{~g})+\mathrm{Cl}_2(\mathrm{~g})$ at equilibrium, upon addition of xenon gas at constant $\mathrm{T} ~\&~ \mathrm{p}$, the concentration of
  1. $\mathrm{PCl}_5$ will increase
  2. $\mathrm{Cl}_2$ will decrease
  3. $\mathrm{PCl}_5, \mathrm{PCl}_3 ~\&~ \mathrm{Cl}_2$ remain constant
  4. $\mathrm{PCl}_3$ will increase

Solution

On addition of inert gas at constant P & T, reaction moves in the direction of greater no. of moles so it will shift in forward direction, so $\left[\mathrm{PCl}_5\right]$ decrease and $\left[\mathrm{PCl}_3\right] ~\&~\left[\mathrm{Cl}_2\right]$ will increase.

Asked in: JEE Main 2025 (03 Apr Shift 1)

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