For the exothermic reaction $$A + B \to C + D,\Delta H$$ is the heat of reaction and $${E_a}$$ is the energy of activation. The energy of activation for the formation of $$A + B$$ will be
A.
$${E_a}$$
B.
$$\Delta H$$
C.
$${E_a} + \Delta H$$
D.
$$\Delta H - {E_a}$$
Answer :
$${E_a} + \Delta H$$
Solution :
For the exothermic reaction the energy of products is always less than the reactants. If $${E_a}$$ is the energy of activation for the forward reaction, the energy of activation for backward reaction is $${E_a} + \Delta H$$
Releted MCQ Question on Physical Chemistry >> Chemical Kinetics
Releted Question 1
If uranium (mass number 238 and atomic number 92) emits an $$\alpha $$ -particle, the product has mass no. and atomic no.