Which statement about a catalyst is INCORRECT?
Correct answer: C. It shifts the equilibrium towards the products
- A. It remains chemically unchanged at the end of the reaction
- B. It is needed only in a small amount
- C. It shifts the equilibrium towards the products
- D. It lowers the activation energy of both the forward and reverse reactions
Explanation
Because a catalyst lowers the barrier equally in both directions, the two rates rise by the same factor and the equilibrium position and the value of Kc are completely unaffected. What changes is how quickly equilibrium is reached. The other three statements are all true, and the small quantity needed follows from the catalyst being regenerated in each cycle.
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About Factors Affecting Rate of Reaction
Reaction rate depends on the nature and concentration of reactants, pressure for gases, temperature, surface area and catalysts. Collision theory explains these effects through collision frequency, orientation and activation energy, while questions often distinguish a catalyst's effect on reaction rate from its lack of effect on equilibrium composition.
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