271. A reaction in which one of the products of reaction acts as a catalyst is called a/an __________ reaction.
Catalytic
Autocatalytic
Photochemical
None of these
✅ The correct answer is option B.
Chemical Reaction Engineering MCQs
272. In a reversible reaction, a catalyst increases the rate of forward reaction
Only
To a greater extent than that of the backward reaction
And decreases that of the backward reaction
And the backward reaction equally
✅ The correct answer is option D.
273. Sum of the powers of the concentration terms in the rate equation is called the __________ of the reaction.
Order
Overall order
Molecularity
None of these
✅ The correct answer is option B.
274. In a zero order reaction, reactants concentration does not change with time and the
Time for half change is half the time taken for completion of the reaction
Time for half change is independent of the initial concentration
Time for completion of the reaction is independent of the initial concentration
Reaction rate is trebled when the initial concentration is trebled
✅ The correct answer is option A.
275. In flow reactors, the performance equations interrelate the rate of reaction to the
Feed rate
Reactor volume
Extent of reaction
All of the above
✅ The correct answer is option D.
276. Equilibrium of a chemical reaction as viewed by kinetics is a __________ state.
Dynamic steady
Static steady
Dynamic unsteady
None of these
✅ The correct answer is option A.
277. The rate of reaction does not decrease appreciably as the reaction proceeds in case of __________ reactions.
Autocatalytic
Exothermic
Endothermic
Autothermal
✅ The correct answer is option A.
278. For a tubular flow reactor with uniform concentration and temperature, the independent variable is
Time
Length
Diameter
None of these
✅ The correct answer is option B.
279. Molecularity of an elementary reaction, P + Q → R + S is
1
2
3
4
✅ The correct answer is option D.
280. In an ideal P.F.R. at steady state conditions
The composition of reactants remains constant along a flow path
The conversion of the reactant varies from point to point along a flow path
There is no lateral mixing of fluid
There may be diffusion along the flow path
✅ The correct answer is option B.