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For an exothermic reaction, following two steps are involved. Step 1. A + B → I slow Step 2. I → AB fast Which of the following graphs correctly represent this reaction ?

Correct answer

1

Step-by-step solution

In any reaction mechanism the no. of activated complexes showing maxima of potential energies is the no. of steps in that mechanism and in between these maxima is a valley where lies a more stable intermediate. There is one reaction intermediate lying at valley of two maxima representing two steps. E a for first step should be higher than second step as first is slow step. These requirements fulfilled by choice (ii) & not choice (i) the choice (iv) is not possible because that is for endothermic reaction Δ H + ve &

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