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Substances which alter the velocity of a reaction by mere presence, without undergoing any change in mass and compossition are termed catalyst and the phenomenon is known as catalysis
For the reaction `(ArarrB+C)` , the energy profile diagram is given in the figure below.

The decrease in the energy of activation in the presence of catalyst is

A

Z

B

`Z-P`

C

`Y-Z`

D

`Z-X`

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The correct Answer is:
B
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