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Question

A catalyst
(IIT-JEE, 1984)


A

Increases the average kinetic energy fo the reacting molecules.

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B

Decreases the activation energy

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C

Alters the reaction mechanism

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D
Increases the frequency of the collisions of the reacting species
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Solution

The correct options are
B

Decreases the activation energy


C

Alters the reaction mechanism


A catalyst provides an alternative path for the reaction occurring via a different activation state.

A positive catalyst decreases the activation energy of a reaction, so that more number of molecules are able to cross the activation energy barrier and so the rate of the reaction is increased.

A negative catalyst increases the activation energy of a reaction so that lesser number of molecules are able to cross the activation energy barrier and so the rate of the reaction is decreased.


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