Consider an endothermic reaction $X \to Y$ with the activation energies $E_{b}$ and $E_{f}$ for the backward and forward reactions respectively. Here

E_{b} > E_{f}

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E_{b} < E_{f}

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E_{b} = E_{f}

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Cannot predict

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Solution

The correct option is B $E_{b} < E_{f}$
Given,
$X ⟶ Y$ is endothermic
For an endothermic reaction $Δ H is positive$
Again,
$Δ H = E_{f} - E_{b}$
$∵ Δ H is positive, thus E_{f} > E_{b}$

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