Answer: Favour PCl₅ formation.
- A Favour PCl₅ formation
- B Favour PCl₃ and Cl₂
- C Have no effect
- D Increase Kc
Correct answer: A. Favour PCl₅ formation
Explanation: Increasing pressure shifts equilibrium towards fewer moles of gas (left, 1 mole from 2 moles), favouring PCl₅.
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.