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JEE Advanced levelSingle correct optionDifficulty 3 of 3sc092

A catalyst lowers the activation energy of a reaction from $80 kJ mo l^{- 1}$ to $60 kJ mo l^{- 1}$ without changing the pre-exponential factor. The catalysed rate constant at $300 K$ equals the uncatalysed rate constant at temperature

A360 K
B400 K
C450 K
D375 K

Answer: B

Equal

k

with equal

A

needs

E_{a 1} / T_{1} = E_{a 2} / T_{2}

. So

T_{1} = 300 \times 80/60 = 400 K

.

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