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Q.

A catalyst:

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a

decreases the activation energy

b

alters the reaction mechanism

c

increases the frequency of collisions of reacting species

d

increases the average kinetic energy of reacting molecules

answer is B, C.

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Detailed Solution

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A catalyst provides a new path of lower activation energy. The catalyst reacts with the reactants to form an intermediate of low activation energy. The intermediate then decomposes to form the products along with regeneration of catalyst. Thus, the reaction mechanism changes completely.

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A catalyst: