Assertion : If the activation energy of reaction is zero temperature will have no effect on the rate constant.

Reason : Lower the activation energy fasten is the reaction.

Assertion : For a reaction $\mathrm{A}\left(\mathrm{g}\right)\to \mathrm{B}\left(\mathrm{g}\right)$

                                 $—{\mathrm{r}}_{\mathbf{e}}=2.5 {\mathrm{P}}_{\mathrm{A}} \mathrm{at} 400\mathrm{K}$

                                 $—{\mathrm{r}}_{\mathbf{e}}=2.5 {\mathrm{P}}_{\mathrm{A}} \mathrm{at} 600\mathrm{K}$

                  activation energy is 4135 J/mol.

Reason : Since for any reaction, values of rate constant at two different temp is same therefore

               activation energy of the reaction is zero.

Assertion : A lump of coal burns at a moderate rate in air while coal dust burns explosively.

Reason : Coal dust contains very fine particles of carbon.

Assertion : Liquid bromine reacts slowly as compared to bromine vapour.

Reason : In liquid bromine, the bromine molecules are held together by a force which is much weaker than the force existing between the two molecules of bromine in the vapour phase.

Assertion : The reaction,

$N_2 \left(10atm\right) 3H_2 \left(10atm\right)\to 2N{H}_3 \left(g\right) is faster.$

Reason : Catalyst lowers the activation energy of the reaction.

Assertion : Molecularity of a reaction cannot be determined experimentally.

Reason : Molecularity is assigned to the reactions on the basis of mechanism.

Assertion : For a first order reaction, the degree of dissocation is equal to $\left(1-e^{-kt}\right)$

Reason  : For a first order reaction, the pre-exponential factor in the Arrhenius equation has the dimension of $tim{e}^{-1}$