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

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

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Chemical Reaction Engineering
A catalyst loses its activity due to

Agglomeration of metal particles caused by thermal sintering of the solid surface
All of these
Covering of the catalytic active sites by a foregin substance
Loss in surface area of the active component

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Chemical Reaction Engineering
In a zero order reaction, reactants concentration does not change with time and the

Time for completion of the reaction is independent of the initial concentration
Time for half change is independent of the initial concentration
Reaction rate is trebled when the initial concentration is trebled
Time for half change is half the time taken for completion of the reaction

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