Chemical Reaction Engineering
The reason why a catalyst increases the rate of reaction is that, it

Increases the activation energy
Decreases the energy barrier for reaction
None of these
Decreases the molecular collision diameter

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Chemical Reaction Engineering
The reactions of high molecularity are rare, because

Many body collisions are not favoured energetically
Of requirement of very large concentration for such reactions
Of low probability of many body collisions
Of very large activation energy of many bodies

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