XA Vs . τ
XA Vs ln τ
XA/(1 – XA)Vs τ
XA(1 – XA)Vs τ
✅ The correct answer is option A.
Chemical Reaction Engineering MCQs
72. The reaction A → B is conducted in an adiabatic plug flow reactor (PFR). Pure A at a concentration of 2 kmol/m³ is fed to the reactor at the rate of 0.01 m³ /s and at a temperature of 500 K. If the exit conversion is 20%, then the exit temperature (in k)is (Data: Heat of reaction at 298 K = – 50000 kJ/ kmole of A reacted Heat capacities CPA = CPB = 100kJ/kmole. K (may be assumed to be independent of temperature))
400
500
600
1000
✅ The correct answer is option C.
73. Differential method for analysing the kinetic data is used
For testing complicated mechanisms
When the data are scattered
When rate expressions are very simple
None of these
✅ The correct answer is option A.
74. Calcination reaction of limestone (CaCO₃ → CaO + CO₂) goes to completion in the rotary kiln, because
CaO is not dissociated
CO₂ escapes continuously
Of high calcination temperature
CaO is more stable than CaCO₃
✅ The correct answer is option B.
75. Sulphuric acid is used as a catalyst in the
Hydrogenation of oils
Gas phase oxidation of SO₂ in chamber process
Alkylation of hydrocarbons
None of these
✅ The correct answer is option C.
76. Which one is the rate controlling step in a solid-gas non-catalytic reaction occurring at very high temperature?
Pore diffusion
Film diffusion
Ash layer diffusion
Chemical reaction
✅ The correct answer is option B.
77. The response curve for a step input signal from a reactor is called C-curve. The variance of C-curve in a ‘tanks in series model’ comprising of ‘m’ tanks is equal to
m
1/m
√m
m²
✅ The correct answer is option B.
78. Which of the following is the most suitable for isothermal operation?
Batch reactor
Back-mix reactor
Plug-flow reactor
Fixed bed reactor
✅ The correct answer is option B.
79. With increase in temperature, the rate constant obeying Arhenious equation
Increases
Decreases
Decreases exponentially
Can either increase or decrease ; depends on the frequency factor
✅ The correct answer is option C.
80. The reaction between oxygen and organic material is a/an __________ reaction.
Exothermic
Endothermic
Biochemical
Photochemical
✅ The correct answer is option A.