In the following system, PCl5(g) PCl3(g) + Cl2(g) at equilibrium,… — Solution | JEE Chemistry

MCQMediumJEE 2025Le Chatelier's Principle

In the following system, $PCl_5(g) \rightleftharpoons PCl_3(g) + Cl_2(g)$ at equilibrium, upon addition of xenon gas at constant $T$ and $p$ , the concentration of

A
$PCl_5$ will increase
B
$Cl_2$ will decrease
C
$PCl_5$ , $PCl_3$ and $Cl_2$ remain constant
D
$PCl_3$ will increase

Answer

Correct answer:D

Step-by-step solution

the solution unavailable

Given: The equilibrium is $PCl_5(g) \rightleftharpoons PCl_3(g) + Cl_2(g)$ and xenon gas is added at constant $T$ and $p$ .

Find: Which concentration changes as a result.

Working could not be extracted because the solution was unavailable. Using the provided correct answer field, the correct option is D.

Common mistakes

Assuming that addition of an inert gas always has no effect on equilibrium is incorrect. At constant pressure, the volume changes, so the partial pressures of reacting gases change. Check whether the condition is constant volume or constant pressure before applying the rule.
Confusing concentration with number of moles is incorrect. Even if xenon does not react chemically, changing the total volume at constant pressure can alter the concentrations of equilibrium species. Track the equilibrium shift, not only chemical reactivity.

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