Question

Which of the following statements about a catalyst is/are true?

• A. A catalyst accelerates the reaction by bringing down the energy of activation.
• B. A catalyst does not take part in the reaction.
• C. A catalyst makes the reaction more feasible by making the $\Delta G^{\circ }$ more negative.
• D. A catalyst makes the equilibrium constant of the reaction more favourable for the forward reaction.

Answer 1

Answer: (A), (B)

Catalyst is any substance that increases the rate of a reaction without itself being consumed.
The most important properties of catalysts are:
1. A catalyst increases the speed of a reaction, and it also improves the yield of the intended product.
2. A catalyst actually takes part in the reaction even though it itself is not consumed or used up in the course of the reaction.
3. A catalyst makes the reaction faster by providing an alternative pathway with a lower activation energy.
4. A catalyst is reaction-specific. It may not be effective in another reaction even if the two reactions are of similar type.
5. In a reversible reaction, a catalyst accelerates both the forward and the reverse reactions. So, the inclusion of a catalyst does not alter the equilibrium constant of a reversible reaction.

6.A catalyst can accelerate the rate of reaction but it can't initiate the reaction thus donot alter the spontaneity or $\Delta G{}^{\circ }$ of the reaction

Therefore option A and B are correct