41. For a zero order reaction, the concentration of product increases with the
Increase of reaction time
Increase in initial concentration
Total pressure
Decrease in total pressure
✅ The correct answer is option A.
Chemical Reaction Engineering MCQs
42. The irreversible reaction, X → Y, is the special case of the reversible reaction, X ⇋ Y, in which the
Equilibrium constant is infinite
Fractional conversion of
Concentration of
All of the above
✅ The correct answer is option D.
43. According to the ‘law of mass action’, the rate of reaction is directly proportional to the
Equilibrium constant
Volume of the reaction vessel
Nature of the reactants
Molar concentration of the reactants
✅ The correct answer is option D.
44. Limiting reactant in a chemical reaction decides the
Rate constant
Conversion
Reaction speed
Equilibrium constant
✅ The correct answer is option B.
45. If Thiele modulus is __________ , then the pore diffusion resistance in a catalyst may be considered as negligible.
0
∞
< 0.5
> 0.5
✅ The correct answer is option C.
46. The reaction A → B is conducted in an isothermal batch reactor. If the conversion of A increases linearly with holding time, then the order of the reaction is
0
1
1.5
2
✅ The correct answer is option A.
47. A space time of 3 hours for a flow reactor means that
The time required to process one reactor volume of feed (measured at specified conditions) is 3 hours
Three reactor volumes of feed can be processed every hour
It takes three hours to dump the entire volume of the reactor with feed
Conversion is cent per cent after three hours
✅ The correct answer is option A.
48. Which of the following is not a unit of reaction rate?
Moles for med/(surface of catalyst) (time)
Moles formed/volume of reactor) (time)
Mole formed/volume of catalyst) (time)
None of these
✅ The correct answer is option D.
49. The rate at which a chemical substance reacts is proportional to its
Active mass
Molecular weight
Equivalent weight
Atomic weight
✅ The correct answer is option A.
50. The time needed to achieve the same fractional conversion for particles of different sizes (d) when chemical reaction controls, is proportional to
D
√d
D1.5
D2
✅ The correct answer is option A.