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

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

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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 = 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 and θ are always equal
τ = θ , for a non-isothermal reactor

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Chemical Reaction Engineering
A first order irreversible reaction, A → B is carried out separately in a constant volume as well as in a variable volume reactor for a particular period. It signifies that __________ in the two reactors.

Conversion in both will be the same but concentrations will be different
Both the conversion as well as concentrations will be different
None of these
Both conversion as well as concentration are same

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