Which graph shows zero activation energy?

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(B) Activation energy $(E_a)$ is defined as the difference between the energy of the transition state and the energy of the reactants.For a reaction t

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(B) Activation energy $(E_a)$ is defined as the difference between the energy of the transition state and the energy of the reactants.For a reaction to have zero activation energy,the energy of the reactants must be equal to the energy of the transition state.In the provided graphs,Graph $B$ shows a linear decrease in energy,which is not a standard representation of a reaction coordinate. However,in the context of such problems,if we consider the energy profile where the energy remains constant or decreases without a barrier,it represents a reaction with no activation barrier.Given the standard options provided in such chemistry problems,Graph $B$ represents a case where the energy of the system decreases linearly,implying no energy barrier exists for the reaction to proceed.Therefore,option $B$ is correct.

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