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a
Increases the average kinetic energy of reacting molecules
b
Increases the activation energy
c
Alters the reaction mechanism
d
Increases the frequency of collisions of reacting species
answer is C.
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Detailed Solution
A catalyst decreases the activation energy of the reactionand takes the reaction through a path of lower activation energyThick line - uncatalysed reactionDotted line - catalysed reactionReaction mechanism in presence of catalyst and absence of catalyst will be different