The graphs shown below are energy profiles for the following reaction - VCE - SSCE Chemistry - Question 11 - 2022 - Paper 1

To determine the correct energy profile for the reverse reaction without a catalyst, we need to analyze the graphs provided.

In the context of endothermic and exothermic reactions, the reverse reaction for an exothermic reaction will yield an energy profile that rises above the starting energy of the products (C in this case). Specifically:

1. The forward reaction (A + B → C) is shown to be exothermic (ΔH < 0), which means energy is released during this process.
2. For the reverse reaction (C → A + B), the energy of the system must increase as it moves from a lower energy state (C) to a higher energy state (A + B).
3. The graph that shows a profile where the energy increases from a point lower than C to higher than C without a catalyst must indicate that it is the reverse of an exothermic reaction.

After reviewing all four graphs, Graph 2 correctly shows this behavior, as it depicts a rise in energy that reflects the characteristics of the reverse reaction without a catalyst. Therefore, the correct answer is B. Graph 2.