Always the same irrespective of the reaction
Dependent on initial concentration of the reactants
Proportional to the initial concentration of reactants
Half the specific rate constant
✅ The correct answer is option B.
Chemical Reaction Engineering MCQs
Fractional conversion __________ with increase in pressure for ammonia synthesis reaction i.e., N₂ + 3H₂ ⇋ 2NH₃.
Increases
Decreases
Remains unchanged
Unpredictable from the data
✅ The correct answer is option A.
For reactions in parallel viz A → P (desired product) and A → Q (unwanted product), if the order of the desired reaction is higher than that of the undesired reaction, a
Batch reactor is preferred over a single CSTR for high yield
Tubular reactor is preferred over a single CSTR for high yield
Both A and B
Single CSTR is the most suitable
✅ The correct answer is option C.
An example of autothermal reactor operation is
Sulphur dioxide oxidation
Ethylene oxidation
Benzene oxidation
Ammonia synthesis
✅ The correct answer is option B.
The fractional volume change between no conversion and complete conversion, for the isothermal gas phase reaction, 2A → R, is
0.5
-0.5
1
1.5
✅ The correct answer is option B.
The dispersion number of perfect mixed flow is
0
> 150
∞
< 2100
✅ The correct answer is option C.
An endothermic aqueous phase first order irreversible reaction is carried out in an adiabatic plug flow reactor. The rate of reaction
Is maximum at the inlet of the reactor
Goes through a maximum along the length of the reactor
Goes through a minimum along the length of the reactor
Is maximum at the exit of the reactor
✅ The correct answer is option A.
In an exothermic chemical reaction, the reactants compared to the products have
Higher temperature
More energy
Less energy
Same energy
✅ The correct answer is option B.
If the rate of a chemical reaction becomes slower at a given temperature, then the
Initial concentration of the reactants remains constant
Free energy of activation is lower
Entropy changes
Free energy of activation is higher
✅ The correct answer is option D.
From among the following, choose one which is not an exothermic process.
Methanol synthesis
Catalytic cracking
Ammonia synthesis
Oxidation of sulphur
✅ The correct answer is option B.