Chemical Reaction Engineering
A first order reaction is to be treated in a series of two mixed reactors. The total volume of the two reactors is minimum, when the reactors are

Equal in size
None of these
Of different sizes
Of such size that the ratio of their volumes is < 5

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Chemical Reaction Engineering
In solid catalysed reactions the diffusional effects are more likely to affect the overall rate of reaction for

Fast reaction in catalyst of large pore diameter
Slow reactions in catalyst of small pore diameter
Fast reactions in catalyst of small pore diameter
Slow reactions in catalyst of large pore diameter

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Chemical Reaction Engineering
A space velocity of 5 hr⁻¹ means that

Cent per cent conversion can be achieved in at least 5 hours
A fixed conversion of a given batch of feed takes 5 hours
Five reactor volumes of feed (at specified conditions) are being fed into the reactor per hour
After every 5 hours, reactor is being filled with the feed

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

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
Density variation during reaction affects design

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