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.Management Sciences
Category: Chemical Reaction
A batch adiabatic reactor at an initial temperature of 373°K is being used for the reaction, A → B. Assume the heat of reaction is – 1kJ/mole at 373°K and heat capacity of both A and B to be constant and equal to 50J/mole.K. The temperature rise after a conversion of 0.5 will be ____________?
A. 5°C
B. 10°C
C. 20°C
D. 100°C
Oil is hydrogenated using nickel catalyst in a __________________ reactor?
A. Batch
B. Slurry
C. Fluidised bed
D. Fixed bed
Pick out the wrong statement?
A. A particular chemical reaction is more temperature sensitive at low temperatures
B. A very high value of equilibrium constant, K (K >> 1) indicates that the reaction is practically
irreversible in nature
C. The intercept of the Arrhenius plot is called the ‘activation energy’
D. Non-ideal flow takes place in reactors due to recycling, channeling or by creation of stagnant
regions
A first order reaction requires two unequal sized CSTR. Which of the following gives higher yield ?
A. Large reactor followed by smaller one
B. Smaller reactor followed by larger one
C. Either of the arrangement A. or B. will give the same yield
D. Data insufficient, can’t be predicted
When a catalyst increases the rate of forward reaction, the value of rate constant__________________?
A. Increases
B. Decreases
C. Remain same
D. Becomes infinite
A liquid phase reaction is to be carried out under isothermal conditions. The reaction rate as a function of conversion has been determined experimentally and is shown in the figure given below. What choice of reactor or combination of reactors will require the minimum overall reactor volume, if a conversion of 0.9 is desired ?
A. CSTR followed by a PFR
B. PFR followed by a CSTR
C. CSTR followed by a PFR followed by a CSTR
D. PFR followed by a CSTR followed by a PFR
If in the gaseous phase reaction, N2O4 ⇌ 2NO2, x is the part of N2O4 which dissociates, then the number of molecules at equilibrium will be___________________?
A. (1 + x)
B. (1 – x)
C. (1 + x)2
D. (1 – x)2
Arrhenius equation shows the variation of ___________________ with temperature?
A. Reaction rate
B. Rate constant
C. Energy of activation
D. Frequency factor
Which of the following is not a chemical step in a fluid solid catalytic reaction ?
A. Surface chemical reaction
B. Adsorption
C. Desorption
D. None of these
The rate controlling step for the heterogeneous irreversible catalytic reaction A(g) + B(g) → C(g) is the surface reaction of absorbed A with absorbed B to give adsorbed C. The rate expression for this reaction can then be written as (where, KA, KB and KC are the equilibrium constants and is the rate constant of the rate controlling step) ?
A. k KA pApB / (1 + KApA + KBpB)
B. k KAKB pApB / (1 + KApA + KBpB)
C. k KAKB pApB / (1 + KApA + KBpB + KCpC)
D. k KAKB pApB / (1 + KApA + KBpB + KCpC)2
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