For the formation of B from A, heat liberated is 20 kJ mol⁻¹. If the activation energy for the reaction B → A is 100 kJ mol⁻¹, then the activation energy (in kJ mol⁻¹) for the reaction A → B is

For the formation of B from A, heat liberated is 20 kJ mol⁻¹. If the activation energy for the reaction B → A… · ABC26PH0677

Subject: Physical Chemistry · Chapter: Chemical Kinetics · Topic: Arrhenius Activation · Exam: JAM 2001-2022 · Marks: 2 · Difficulty: Medium

For the formation of B from A , heat liberated is $20 \mathrm{kJ} \mathrm{mol}^{-1}$. If the activation energy for the reaction $\mathrm{B} \rightarrow \mathrm{A}$ is 100 $\mathrm{kJ} \mathrm{mol}^{-1}$, then the activation energy (in $\mathrm{kJ} \mathrm{mol}^{-1}$ ) for the reaction $\mathrm{A} \rightarrow \mathrm{B}$ is

(a)120

(b)100

(c)80

(d)60

Answer

Answer: C ✓ checked by 4AB · confidence high

Explanation

ΔH(A→B) = −20 kJ, so Ea(A→B) = Ea(B→A) + ΔH = 100 − 20 = 80 kJ mol⁻¹ (c).

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