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  • Which of the following graph represents the exothermic reaction?

Which of the following graph represents the exothermic reaction?

(i) (a) only

(ii) (b) only

(iii) (c) only

(iv) (a) and (b)

Answers (1)

The answer is the option (i). In an exothermic reaction, the reaction activation energy of the product should be higher than that of the reactant whereas the enthalpy of the reactant should be greater than that of the products.

Activation energy is the minimum amount of energy that must be available to reactants for a chemical reaction to occur. The activation energy of a reaction is measured in kilojoules per mole or kilocalories per mole.

When reactant molecules collide with each other at its highest energy point, an intermediate is formed which remains in equilibrium with the main reactant. If this intermediate complex has an energy equal to or greater than the Threshold Energy, it will be converted into a product.

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