Chemical Reaction Engineering
For the non-catalytic reaction of particles with surrounding fluid, the time needed to achieve the same fractional conversion for particles of different but unchanging sizes is proportional to the square of particle diameter, when the __________ is the controlling resistance.

Either A, B or C
Diffusion through ash layer
Chemical reaction
Film diffusion

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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

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

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

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

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Chemical Reaction Engineering
For a tubular reactor with space time 'τ' and residence time 'θ', the following statement holds good.

τ and θ are always equal
τ = θ , when the fluid density changes in the reactor
τ = θ , for an isothermic tubular reactor in which the density of the process fluid is constant
τ = θ , for a non-isothermal reactor

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