The correct reaction profile diagram for a positive catalyst reaction .
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Catalysts speed up reactions by decreasing activation energy, but they do not alter the enthalpy change (∆H) of the reaction
The Correct Option is C
Solution and Explanation
A positive catalyst increases the reaction rate by lowering the activation energy. Activation energy is the minimum energy required for reactants to form products. In the given diagrams:
- Option (1): Incorrect. The diagram does not depict a lowered activation energy.
- Option (2): This graph does not represent the effect of a catalyst, as the activation energy remains unchanged.
- Option (3): Correct. This diagram clearly shows a decrease in the activation energy when a catalyst is present while keeping the relative energies of reactants and products unchanged.
- Option (4) : Incorrect. While the curve changes, it does not correctly indicate the role of a positive catalyst.
Thus, the correct diagram representing a positive catalyst is option (3)
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