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.Management Sciences
Category: Chemical Reaction
The eddy diffusivity for a liquid in plug flow must be_________________?
A. 1
B. 0
C. ∞
D. Between 0 and 1
The units of frequency factor in Arrhenius equation_________________?
A. Are the same as those of the rate constant
B. Depend on the order of the reaction
C. Depend on temperature, pressure etc. of the reaction
D. Are cycles per unit time
For the liquid phase parallel reactions__________________?
R, rR = K1.CA2; E1 = 80 KJ/mole
S, rs = K1.CA ; E2 = 120 KJ/mole
The desired product is R. A higher selectivity of R will be achieved, if the reaction is conducted
at
A. Low temperature in a CSTR
B. High temperature in a CSTR
C. Low temperature in a PFR
D. High temperature in a PFR
An example of autothermal reactor operation is______________________?
A. Sulphur dioxide oxidation
B. Ethylene oxidation
C. Benzene oxidation
D. Ammonia synthesis
If n = overall order of a chemical reaction. a = initial concentration of reactant. t = time required to complete a definite fraction of the reaction. Then pick out the correct relationship ?
A. t ∝ 1/an
B. t ∝ 1/an – 1
C. t ∝ 1/an + 1
D. t ∝ an
For the non-catalytic reaction of particles with surrounding fluid, the time needed to achieve the same fractional conversion for particles of different but unchanging sizes is proportional to the square of particle diameter, when the _______________ is the controlling resistance?
A. Film diffusion
B. Diffusion through ash layer
C. Chemical reaction
D. Either A., B. or C.
If helium is introduced in a reactor containing O2, SO2 and SO3 at equilibrium, so that total pressure increases while volume and temperature remains constant. In this case the dissociation of SO3 (as per Le Chatelier’s principle)?
A. Decreases
B. Increases
C. Remains unaltered
D. Changes unpredictably
A catalyst inhibitor____________________?
A. Lessens its selectivity
B. May be useful for suppressing undesirable side reactions
C. Is added in small quantity during the catalyst manufacture itself
D. All A., B. and C.
Which of the following is a controlling factor in very fast heterogeneous reaction ?
A. Heat and mass transfer effects
B. Pressure
C. Temperature
D. Composition of reactant
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