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Q.

An endothermic reaction $A \to B$ has an activation energy $15 kcal / mole$ and the heat of reaction is $5 kcal / mole$ . The activation energy of the reaction $B \to A$ is

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a

$20 kcal / mole$

b

zero

c

$15 kcal / mole$

d

$10 kcal / mole$

answer is C.

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Detailed Solution

For an endothermic reaction, the activation energy for the backward reaction is equal to the difference of the activation energy of the forward reaction and the enthalpy change of the reaction.
Thus, the activation energy of the reaction $B \to A$ is $15 - 5 = 10 kcal$ .

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An endothermic reaction A→B has an activation energy 15kcal/mole and the heat of reaction is 5kcal/mole. The activation energy of the reaction B→A is