MHT-CET

17. ⁠Chemical kinetics question bank (Chemistry)

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Q1.

What is the role of a catalyst in a catalytic reaction?

(A)
It decreases the enthalpy of reaction.
(B)
It increases the enthalpy of reaction.
(C)
It decreases the energy of activation of reaction.
(D)
It increases the energy of activation of reaction.
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Q2.

The rate constant of a first-order reaction is $1.5 \times 10^7 \text{ s}^{-1}$ at $300 \text{ K}$ and $3.0 \times 10^7 \text{ s}^{-1}$ at $330 \text{ K}$. What is the activation energy $(E_a)$ for the reaction? $[R \times 2.303 = 19.15 \text{ J K}^{-1} \text{mol}^{-1}]$

(A)
$18.02 \text{ kJ mol}^{-1}$
(B)
$20.1 \text{ kJ mol}^{-1}$
(C)
$19.02 \text{ kJ mol}^{-1}$
(D)
$21.5 \text{ kJ mol}^{-1}$
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