Assertion (A) : Catalyst alters the individual energies of the reactants and products
Reason (R) : As such more number of molecules are able to cross the barrier per unit time.
`Delta H or Delta U` of the reaction remains unaltered.

Assertion (A) : In a reaction A rarr Products, the concentratiton of the reactant is reduced to zero after a finite time Reason (R) : The order of reaction is zero.

Statement-1: A catayst provides an alternative path to the reaction in which conversion of reactants into products take place quickly. Statement-2: The catalyst forms an activated comlex of lower potential energy, with the reactants by which more number of molecules are able to cross the barrier per unit of time.

Assertion (A): Poistive catalyst lowers the activation energy of the reaction whereas the heat of reaction remains same. Reason (R ): The heat of reaction is equal to the difference between activation energies for forward and backward reactions.

Assertion (A): Poistive catalyst lowers the activation energy of the reaction whereas the heat of reaction remains same. Reason (R ): The heat of reaction is equal to the difference between activation energies for forward and backward reactions.

Assertion (A) : A catalyst provides an alternative path to the reaction in which conversion of reactants into products takes place quickly Reason (R) : The catalyst forms an activated complex of lower potential energy with the reactants.

Assertion (A) : All collisions between the reactant molecules result in product formation . Reason (R) : The collision between molecules having sufficient amount of energy and proper orientations, results in the formation of compounds.

Assertion (A) : Molecularity of the reaction H_2 + Br_2 rarr 2HBr appears to be 2 Reason (R) : Two molecules of the reactants are involved in the given elementary reaction