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An exothermic chemical reaction proceeds...

An exothermic chemical reaction proceeds by two stages reactants `overset("Stage I")(rarr) "intermdediate" overset("Stage II")(rarr)` products, The activation energy of stage `I` is `50 kJ mol^(-1)`. The overall enthalpy change of the reaction is `-100 "kJ mol"^(-1)`. Which diagram could represent the energy level diagram for the reaction ?

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