JEE Main levelSingle correct optionDifficulty 2 of 3bm117
An enzyme E catalyses the reaction SP at constant temperature. Which statement is correct?
AThe enzyme lowers the activation energy of the forward reaction only, so the equilibrium shifts towards P.
BThe enzyme makes ΔG of the reaction more negative and so increases the equilibrium constant.
CThe enzyme lowers the activation energy of both the forward and the reverse reaction and leaves ΔG and the equilibrium constant unchanged.
DThe enzyme is consumed in the reaction and must be regenerated for the reaction to continue.
Answer: C
A catalyst provides a lower-energy pathway for both directions. ΔG and K depend only on the energies of S and P, so they are unchanged. The enzyme is regenerated and not consumed, so only the first option is correct.