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  • Assertion The answer is the option (i): The enthalpy of reaction remains constant in the presence of a catalyst. Reason (R): A catalyst participating in the reaction, forms different activated complex and lowers down the activation energy

In the following question, a statement of Assertion The answer is the option (i) followed by a statement of Reason (R) is given. Choose the correct option out of the following choices:

Assertion The answer is the option (i): The enthalpy of reaction remains constant in the presence of a catalyst.
Reason (R): A catalyst participating in the reaction, forms different activated complex and lowers down the activation energy but the difference in energy of reactant and product remains the same.

(i) Both Assertion and Reason are correct and the reason is the correct explanation of Assertion.
(ii) Both assertion and reason are correct but Reason is not the correct explanation of Assertion
(iii) Assertion is correct but Reason is incorrect.
(iv) Both Assertion and Reason are incorrect.
(v) Assertion is incorrect but Reason is correct.

Answers (1)

The answer is the option (i) \Delta H = Activation Energy of forward reaction – Activation Energy of reverse reaction.
The heat of reaction remains unaltered by the catalysts because it does not involve directly in the reaction and only affects the activation energy reactions. The enthalpy of reaction remains unchanged due to the addition of catalyst.

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