Chemical Reaction Engineering
A reversible liquid phase endothermic reaction is to be carried out in a plug flow reactor. For minimum reactor volume, it should be operated such that the temperature along the length

First increases and then decreases
Is at the highest allowable temperature throughout
Decreases
Increases

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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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