A) \[<50\]kcal
B) either greater than or less than 50 kcal
C) 50 kcal
D) \[>50\]kcal
Correct Answer: B
Solution :
\[\Delta H={{E}_{a\,(f)}}-{{E}_{a\,(b)}}\] Thus energy of activation for reverse reaction depend upon whether reaction is exothermic or endothermic. If reaction is exothermic, \[\Delta H=-ve,\] \[{{E}_{a\,(b)}}>{{E}_{a\,(f)}}\] If reaction is endothermic, \[\Delta H=+ve\] \[{{E}_{a\,(b)}}<{{E}_{a\,(f)}}\]
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