L.0 to 10⁻⁸
L.l.to 10²
0.1 to 0.9
None of these
✅ The correct answer is option A.
Chemical Reaction Engineering MCQs
In the hydrodealkylation of toluene to benzene, the following reactions occur: C₇H₈ + H₂ → C₆H₆ + CH₄ 2C₆H₆ ⇋ C₁₂H₁₀ + H₂ Toluene and hydrogen are fed to a reactor in a molar ratio 1:5.80% of the toluene gets converted and the selectivity of benzene(defined as moles of benzene formed/moles of toluene converted) is 90%. The fractional conversion of hydrogen is
0.16
0.144
0.152
0.136
✅ The correct answer is option B.
When the density of the reaction mixture is constant in a chemical reaction, the ratio of the mean residence time to space time is
> 1
< 1
1
0
✅ The correct answer is option C.
Maximum equilibrium conversion for endothermic reaction is obtained at the __________ temperature.
Highest possible
Lowest possible
Intermediate
Room
✅ The correct answer is option A.
A chemical reaction, A → 3B, is conducted in a constant pressure vessel. Starting with pure A, the volume of the reaction mixture increases 3 times in 6 minutes. The fractional conversion is
0.33
0.5
1
Data insufficient, can’t be predicted
✅ The correct answer is option C.
For identical flow rate, feed composition and for elementary first order reactions, ‘N’ equal sized mixed reactors in series with a total volume ‘V’ gives the same conversion as a single plug flow reactor of volume ‘V’ for constant density systems. This is true, when the value of ‘N’ is
1
>1
∞
≥1
✅ The correct answer is option C.
__________ is the controlling step in a highly temperature sensitive fluid-solid non-catalytic reaction.
Gas film diffusion
Ash diffusion
Chemical reaction
None of these
✅ The correct answer is option C.
Which of the following resistances is not involved in a gas phase catalytic (gas- solid) reaction?
Ash resistance
Gas film and pore surface diffusion resistances for reactants
Surface phenomenon resistance
Gas film and pore surface diffusion resistances for products
✅ The correct answer is option A.
With increase in initial concentration, the fractional conversion of a first order reaction in a given time
Increases
Decreases
Remains constant
Unpredictable
✅ The correct answer is option C.