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

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

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Chemical Reaction Engineering
Semibatch reactor is preferred, when a/an

A highly exothermic reaction is to be controlled
A gas is to be reacted with liquid (e.g. hydrogenation of fat)
All of these
Undersirable side reaction (at high concentration of one of the reactants) is to be avoided

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Chemical Reaction Engineering
A catalyst loses its activity due to

All of these
Agglomeration of metal particles caused by thermal sintering of the solid surface
Loss in surface area of the active component
Covering of the catalytic active sites by a foregin substance

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