'If the catalyst pore size is small in comparison with the mean free path, colli

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Question
'If the catalyst pore size is small in comparison with the mean free path, collisions with the pore wall controls the process'. The diffusivity under this condition is called 'Knudsen diffusivity', which is affected by the
Options
A. pressure
B. temperature
C. both (a) & (b)
D. neither (a) nor (b)

Correct Answer

temperature

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3. A catalyst loses its activity due to
Options
A. loss in surface area of the active component.
B. agglomeration of metal particles caused by thermal sintering of the solid surface.
C. covering of the catalytic active sites by a foregin substance.
D. all (a), (b) and (c).

4. For a zero order chemical reaction, the
Options
A. half life period is directly proportion to the initial concentration of the reac-tants.
B. plot of products concentration with time is a straight line through the origin.
C. products concentration increases linerarly with time.
D. all (a), (b) and (c).

5. The reason why a catalyst increases the rate of reaction is that, it
Options
A. decreases the energy barrier for reaction.
B. increases the activation energy.
C. decreases the molecular collision diameter.
D. none of these.

9. For high conversion in a highly exothermic solid catalysed reaction, use a __________ bed reactor.
Options
A. fixed
B. fluidised bed reactor followed by a fixed
C. fixed bed reactor followed by a fluidised
D. fluidised

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