Chemical Engineering - Chemical Reaction Engineering

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Exercise

"Act well your part; there all honor lies."

- Alexander Pope

46.

A catalyst promoter

A.	improves the activity of a catalyst.
B.	acts as a catalyst support.
C.	itself has very high activity.
D.	all (a), (b) and (c).

47.

In case of a P.F.R., there

A.	may be lateral mixing of fluid.
B.	should not be any mixing along the flow path.
C.	both (a) and (b).
D.	neither (a) nor (b).

48.

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.

A.	film diffusion
B.	diffusion through ash layer
C.	chemical reaction
D.	either (a), (b) or (c)

49.

If ΔG (free energy change) for a chemical reaction is very large and negative, then the reaction is

A.	not feasible.
B.	just feasible.
C.	very much feasible.
D.	unpredictable as ΔG is no measure of feasibility of a reaction.

50.

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

A.	time for half change is half the time taken for completion of the reaction.
B.	time for half change is independent of the initial concentration.
C.	time for completion of the reaction is independent of the initial concentration.
D.	reaction rate is trebled when the initial concentration is trebled.