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Question

A catalyst
                                                                                       (IIT-JEE, 1984)


  1. Increases the average kinetic energy fo the reacting molecules.

  2. Decreases the activation energy

  3. Alters the reaction mechanism

  4. Increases the frequency of the collisions of the reacting species


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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