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Q.

A catalyst

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a

Increases the frequency of collisions of reacting species

b

Increases the activation energy 

c

Alters the reaction mechanism

d

Increases the average kinetic energy of reacting molecules

answer is C.

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Detailed Solution

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A catalyst is a substance increases the rate of reaction without taking part in the chemical reaction. A catalyst lowers the activation energy of the reaction by providing an alternate pathway of the reaction. This implies that it alters or changes the reaction mechanism.

Hence, option (C) is correct. 

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