Chemical Reaction Engineering
For reactions in parallel viz A → P (desired product) and A → Q (unwanted product), if the order of the desired reaction is higher than that of the undesired reaction, a

Both A and B
Batch reactor is preferred over a single CSTR for high yield
Tubular reactor is preferred over a single CSTR for high yield
Single CSTR is the most suitable

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Chemical Reaction Engineering
A space time of 3 hours for a flow reactor means that

It takes three hours to dump the entire volume of the reactor with feed
Conversion is cent per cent after three hours
Three reactor volumes of feed can be processed every hour
The time required to process one reactor volume of feed (measured at specified conditions) is 3 hours

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Chemical Reaction Engineering
In an ideal P.F.R. at steady state conditions

The composition of reactants remains constant along a flow path
The conversion of the reactant varies from point to point along a flow path
There is no lateral mixing of fluid
There may be diffusion along the flow path

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