Chemical Reaction Engineering
For a first order isothermal chemical reaction in a porous catalyst, the effectiveness factor is 0.3. The effectiveness factor will increase if the

Catalyst size is increased or the catalyst diffusivity is reduced
Catalyst size is increased or the catalyst diffusivity is increased
Catalyst size is reduced or the catalyst diffusivity is increased
Catalyst size is reduced or the catalyst diffusivity is reduced

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Chemical Reaction Engineering
Which of the following is the optimum operating condition for an exothermic reversible reaction taking place in a plug-flow reactor?

Temperature should be high in the beginning and decreased towards the end of the reaction
None of these
Very low temperature should be used throughout the reaction
Very high temperature should be used throughout the reaction

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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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