Chemical Reaction Engineering
If 'n' is the order of reaction, then unit of rate constant is

(time)n - 1 (concentration)
(time)-1 (concentration)n - 1
1/(time)(concentration)n - 1
None of these

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

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

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Chemical Reaction Engineering
For all positive reaction orders for a particular duty,

Density variation during reaction affects design
Mixed reactor is always larger than the plug-flow reactor
Reactor size is independent of the type of flow
Ratio of the volume of the mixed reactor to that of the plug-flow reactor decreases with order

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