A poistive catalyst increases the activa...

A poistive catalyst increases the activation energy of the reaction.

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Which of the following factors are responsible for the increase in the rate of a surface catalysed reaction? (i) A catalyst provides proper orientation for the reactant molecules to react. (ii) heat of adsorption of reactants on a catalyst helps reactant molecules to overcome activation energy. (iii) The catalyst increases the activation energy of the reactio.

Which of the following factors are responsible for the increase in the rate of a surface catalysed reaction ? (I) A catalyst provides proper orientation for the reactant molecules (II) Heat of adsorption of reactants on a catalyst helps reactant molecules to overcome activation energy (III) The catalyst increases the activation energy of the reaction (IV) Adsorption increases the local concentration of reactant molecules on the surface of the catalyst. Select the correct answer using the codes given below:

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.

At 227^(@)C , the presence of catalyst causes the activation energy of a reaction to decrease by 4.606 K cal. The rate of the reaction will be increased by : -

(A) A catalyst increases the rate of areaction. (R)In presence of a catalyst, the activation energy of the reaction increases.

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

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