251. In autocatalytic reactions,
One of the reactants acts as a catalyst
One of the products acts as a catalyst
Catalysts have very high selectivity
No catalyst is used
✅ The correct answer is option B.
Chemical Reaction Engineering MCQs
252. The size of plug flow reactor (PFR) for all positive reaction orders and for any given duty, is __________ that of mixed reactor.
Greater than
Equal to
Smaller than
Unpredictable from the data
✅ The correct answer is option C.
253. Shift conversion reaction
Converts N₂ and H₂ into NH₃
Converts CO to CO₂ with steam
Is non-catalytic
Is highly exothermic
✅ The correct answer is option B.
254. Given, 3H₂ + CO = CH₄ + H₂O, KP = 101.84 and, 4H₂ + CO₂ = CH₄ + 2H₂O, KP = 101.17 the KP for the reaction CO + H₂O = CO₂ + H₂ is
103.01
10-0.67
10-3.01
L00.67
✅ The correct answer is option D.
255. In the gaseous phase ammonia formation reaction (N₂ + 3H₂ ⇋ 2NH₃), the value of the equilibrium constant depends on the
Total pressure of the system
Volume of the reactor
Temperature
Initial concentration of N₂ and H₂
✅ The correct answer is option C.
256. The space time is equivalent to the holding time in a steady state mixed reactor for
Non-isothermal gas reaction
Variable fluid density systems
Constant fluid density systems
Gas reactions with changing no. of moles
✅ The correct answer is option C.
257. The fractional volume change of the system for the isothermal gas phase reaction, A 3B , between no conversion and complete conversion is
0.5
1
2
3
✅ The correct answer is option C.
258. The use of space time is preferred over the mean residence time in the design of a/an
Batch reactor
Ideal tubular-flow reactor
Slurry reactor
CSTR
✅ The correct answer is option B.
259. In a reversible chemical reaction having two reactants in equilibrium, if the concentration of the reactants are doubled, then the equilibrium constant will
Remain the same
Be halved
Also be doubled
Become one fourth
✅ The correct answer is option A.
260. A first order reaction requires two unequal sized CSTR. Which of the following gives higher yield ?
Large reactor followed by smaller one
Smaller reactor followed by larger one
Either of the arrangement A or B will give the same yield
Data insufficient, can
✅ The correct answer is option C.