alleryAdding an inert gas at constant volume to a gaseous equilibrium:
AShifts equilibrium towards products
BShifts equilibrium towards reactants
CDoes not shift the equilibrium
DStops the reaction
Answer & Solution
Correct answer: C. Does not shift the equilibrium
1. At constant volume, partial pressures of the reacting species do not change when an inert gas is added.
2. Total pressure rises, but P_A, P_B etc are unchanged.
3. Reaction quotient Q = K_p still — no shift.
4. At constant PRESSURE (not volume), inert gas addition decreases reactant partial pressures and CAN shift equilibrium.
_Source: syllabus Chem Ch 7 §7.6 Effect of Inert Gas_
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