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The correct statement regarding the func...

The correct statement regarding the functioining of a catalyst is that it :
`Irarr` alters the energy lelvels of the reactants and products
`IIrarr` provides an alternae path for climbing the activation energy barrier
`IIIrarr` makes the reacton thermodynamically feasible
`IVrarr` provides a different mechanism for the reaction

A

I and II

B

I and IIII

C

II and IV

D

III and IV

Text Solution

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The correct Answer is:
C
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Assertion(A): A catalyst speed up a reaction but does not participate in its mechanism. Reason(R): A catalyst provides an alternative path of lower activation energy to the reactants.

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.

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) : 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.

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:

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