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Chemistry Chemical Equilibrium JEE Main 2023 Single Correct MCQ
Published on: August 13, 2026

The effect of addition of helium gas to the following reaction in equilibrium state, is :

PCI 5 (g) PCl 3 (g) + Cl 2 (g)

A
the equilibrium will shift in the forward direction and more of Cl 2 and PCl 3 gases will be produced.
B
the equilibrium will go backward due to suppression of dissociation of PC1 5 .
C
helium will deactivate PCl 5 and reaction will stop.
D
addition of helium will not affect the equilibrium.

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Verified by Experts
The correct answer is:
A

PCI 5 (g) PC1 3 (g) + C1 2 (g)

(Case 1 : At constant P - volume will increase so reaction will shift in forward direction then answer will be A

Case 2 : At constant volume no change in active mass so reaction will not shift in any direction then

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