A very large value of the equilibrium constant Kc indicates that
Correct answer: D. the products are strongly favoured at equilibrium
- A. the reaction reaches equilibrium very quickly
- B. the reaction is exothermic
- C. the reactants are favoured at equilibrium
- D. the products are strongly favoured at equilibrium
Explanation
Kc compares product to reactant concentrations, so a large value means the equilibrium position lies far to the right and the reaction goes almost to completion. Kc says nothing at all about how fast equilibrium is reached, which is a matter of kinetics, and this is the confusion the question targets. The Haber process is the classic case of a favourable equilibrium that is nevertheless slow without a catalyst.
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About Reversible Reactions
A reversible reaction proceeds in both forward and backward directions, so reactants and products continue changing until dynamic equilibrium is established. The topic covers the meaning of equilibrium, the equality of forward and reverse rates, and how concentration, pressure and temperature disturb equilibrium, which is separate from the rate at which equilibrium is reached.
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