A catalyst lowers the activation energy from $20 kJ {mol}^{- 1}$ to $15 kJ {mol}^{- 1}$ of the forward direction of the reaction $A ⇌ B$ . Which of the following statement regarding the reaction is correct?

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Enthalpy ofreaction is increased by $5 kJ {mol}^{- 1}$

Activation energy of the backward direction is increased by $5 kJ {mol}^{- 1}$

Equilibrium constant of the reaction is decreased

Activation energy of the backward direction is decreased by $5 kJ {mol}^{- 1}$

answer is B.

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Detailed Solution

Energy of backward reaction is also decreased by $5 kJ {mol}^{- 1}$ without affecting the value of $Δ H$ and $K_{eq}$ of the reaction.

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