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A catalyst :...

A catalyst :

A

Increases the average kinetic energy of the reacting molecules.

B

Decreases the activation energy

C

Alters the reaction mechanism

D

Increases the frequency of the colliisons of the reacting species

Text Solution

Verified by Experts

The correct Answer is:
B, C
A catalyst provides an alternative path for the reaction occuring via a different activation state.
A poistive 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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Knowledge Check

  • Wilkinson's catalyst is

    A
    Ni
    B
    `[(C_6H_5 )_3 P]_3 RhCl`
    C
    `LiAlH_4`
    D
    `Fe_2 O_3`

  • The catalyst used for the polymerization of olefins is

    A
    Ziegler-Natta catalyst
    B
    Wilkinson's catalyst
    C
    Pd-catalyst
    D
    Zeise's salt complex

  • The catalyst used for olefin polymerisation is

    A
    Ziegler-Natta catalyst
    B
    Wilkinson catalyst
    C
    Raney nickel catalyst
    D
    Merrifield resin