11. What is the dispersion number for a CSTR?
0
1
< 1
∞
✅ The correct answer is option D.
Chemical Reaction Engineering MCQs
12. The catalyst in a first order chemical reaction changes the
Equilibrium constant
Activation energy
Heat of formation of the product
Heat of reaction
✅ The correct answer is option B.
13. Which of the following will give maximum gas conversion?
Fixed bed reactor
Fluidised bed reactor
Semi-fluidised bed reactor
Plug-flow catalytic reactor
✅ The correct answer is option C.
14. In an ideal tubular-flow reactor
There is no mixing in longitudinal direction
Mixing takes place in radial direction
There is a uniform velocity across the radius
All of the above
✅ The correct answer is option D.
15. If ‘n’ is the order of reaction, then unit of rate constant is
1/(time)(concentration)n – 1
(time)-1 (concentration)n – 1
(time)n – 1 (concentration)
None of these
✅ The correct answer is option A.
16. Study of chemical kinetics is the easiest in the case of __________ reactions.
Irreversible
Reversible
Surface
Side
✅ The correct answer is option A.
19. 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
✅ The correct answer is option C.
20. At a given temperature, K₁, K₂ and K3 are equilibrium constants for the following reactions 1, 2, 3 respectively. CH₄(g) + H₂O(g) ⇋ CO(g) + 3H₂(g), CO(g) + H₂O(g) ⇋ CO₂(g) + H₂(g) CH₄(g) + 2H₂O(g) ⇋ CO₂(g) + 4H₂(g) Then K₁, K₂ and K3 are related as:
K3 = K₁.K₂
K3 = (K₁.K₂)0.5
K3(K₁+K₂)/2
K3 = (K₁.K₂)2
✅ The correct answer is option A.