Answer: There is no effect on the equilibrium position.
- A It increases the value of Kc for the reaction
- B It shifts the equilibrium towards SO<sub>2</sub> and O<sub>2</sub>
- C It shifts the equilibrium towards SO<sub>3</sub> formation
- D There is no effect on the equilibrium position
Correct answer: D. There is no effect on the equilibrium position
Explanation: Adding an inert gas at constant volume does not change the partial pressures or concentrations of the reacting species, so the equilibrium position is unaffected.
As the reaction proceeds, reactant concentration falls and product concentration rises until both level off at equilibrium.
Concept context
When forward and reverse reaction rates are equal, equilibrium is reached. Learn about Kc, Kp, Le Chatelier's principle, and acid-base equilibria, including pH, buffer solutions, and solubility product.