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The activation energy of the reaction, `A+BtoC+D+38` kcal is 20 kcal. What would be the activation energy pof the following reaction. `C+DtoA+B`

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The activation energy of the reaction, `A+BtoC+D+38` kcal is 20 kcal. What would be the activation energy pof the following reaction.
`C+DtoA+B`
A. 20 kcal
B. `-20 kcal`
C. 18 kcal
D. 58 kcal
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Correct Answer - D
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