Assertion (A) 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 enrgy of reactant and product remains the same.
(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.
Answer (a). Assertion and reason both are correct and the reason is the correct explanation of assertion.
Enthalpy of reaction i.e., the difference of total enthalpy of reactants and product remains constant in the presence of a catalyst. As a catalyst participating in the reaction forms the different activated complex and lowers down the activation energy but the difference in energy of reactant and product remains same.