The effect of addition of helium gas to the following reaction at constant volume in equilibrium state is: PCl5(g)…
Chemical Equilibrium · Class 11 · JEE Main Previous Year Question
The effect of addition of helium gas to the following reaction at constant volume in equilibrium state is:
- a
The equilibrium will shift in the forward direction and more of and will be produced
- b
The equilibrium will go backward due to suppression of dissociation of
- c
Helium will deactivate and reaction will stop
- d✓
Addition of helium will not affect the equilibrium
Addition of helium will not affect the equilibrium
Key Concept: Adding an inert gas at constant volume does not change the partial pressures (or concentrations) of any reacting species.
Step 1 — Effect on partial pressures: At constant volume, adding He increases total pressure but the partial pressures of , , and remain unchanged.
Step 2 — Effect on equilibrium: Since no partial pressure changes, equilibrium is unaffected.
Note: If He were added at constant pressure, the equilibrium would shift forward (mole fraction of reactants increases).
Answer: Option (4)
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