Assertion : A catalyst lowers the threshold energy level for a reaction
Reason : A catalyst combines with one of the reactans of from an intermediate the follows an alternate path with lesser energy of activation.

Statements : A catalyst lowers the threshokd energy level for reaction . Explanations : Catalyst combines with reactabnt to form an exothermic intermediate and provide another parthway to traction .

Statements : A catalyst doesnot alter the equilibrium constant os a reaction . Expabnations : A catalyst complex with the reactants and provides an alternate path wirh a lower energy of activation for the reacton . The forwaord and forwad and reverse reactions are affected to the same extent .

Assertion: A catalyst increases the rate of a reaction. Reason: In presence of a catalyst, the activation energy of the reaction decreases.

Assertion: A catalyst increases the rate of a reaction. Reason: In presence of a catalyst, the activation energy of the reaction decreases.

Assertiojn (A):A catalyst increases that rate of a reaction . ReasonR): In the presence of a catalyst,the activation energy of the reaction increases.

Assertion (A) : Catalyst increases the rate of a reaction Reason (R) : It lowers the threshold energy of the reaction.