chemical engineering MCQs – Page 140

Practise multiple-choice questions from chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs

2781. Which of the following curves shows the effect of temperature on the extent of gas-solid adsorption at a given pressure ?
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A. Langmuir adsorption isotherm

B. None of these

C. Adsorption isobar

D. Freundlich adsorption isotherm

2782. For any reaction, we may write conversion as a function of______________________?
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A. Concentration

B. Time

C. Temperature

D. All A., B. & C.

2783. Which of the following is not a theory of homogeneous reaction ?
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A. None of these

B. Radiation hypothesis

C. Chain reaction theory

D. Collision theory and activated complex theory

2784. A CSTR is to be designed in which an exothermic liquid phase first order reaction of the type, A ? R, is taking place. The reactor is to be provided with a jacket in which coolant is flowing. Following data is given: CA0= 5 kmole/m3; XA = 0.5; Feed temperature = reactor temperature = 40C. Rate constant at 40C = 1 min-1; (?H) = 40kJ/mole; ? = 1000kg/m3 CP = 4 J/gm.C ; q = 10-3 m3/min (? and CP are same for the reactant and product streams). The amount of heat to be removed is_________________?
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A. 1 kW

B. 2/3 kW

C. 4 kW

D. 5/3 kW

2785. The following half life data are available for the irreversible liquid phase reaction A ? products. The overall order of reaction is __________________?
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A. 0.5

B. 1

C. 1.5

D. 2

2786. A rise in temperature ______________________?
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A. Does not affect photo-chemical reaction rates

B. Does not affect a catalysed reaction

C. All A., B. and C.

D. Normally tends to increase the reaction rate

2787. The reactions with low activation energy are _____________________?
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A. Slow

B. Fast

C. Non-spontaneous

D. Always spontaneous

2788. The reaction rate almost gets doubled for 10C rise in temperature. This is due to the fact that the_________________?
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A. Increased temperature reduces the activation energy

B. Value of threshold energy decreases

C. Fraction of molecules having threshold energy increases

D. Collision frequency increases

2789. Photo-chemical reactions occur in presence of ___________________?
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A. Solid catalysts

B. Sunlight

C. Darkness

D. Monochromatic radiation only

2790. The reaction A ? B is conducted in an isothermal batch reactor. If the conversion of A increases linearly with holding time, then the order of the reaction is __________________?
0

A. 1

B. 2

C. 0

D. 1.5

2791. For an autocatalytic reactor, the suitable reactor set up is__________________?
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A. CSTR in series

B. P.F. reactors in series

C. P.F. reactor followed by CSTR

D. CSTR followed by P.F. reactor

2792. The reaction in which the rate equation corresponds to a stoichiometric equation, is called a/an _______________ reaction?
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A. Autokinetic

B. Non-elementary

C. Elementary

D. Parallel

2793. Bulk diffusion in catalyst pore _______________ with increase in pressure?
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A. Increases

B. Increases exponentially

C. Remains unchanged

D. Decreases

2794. In a consecutive reaction system of the given figure bellow, when E1 is much greater than E2, the yield of B increases with the____________________?
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A. Decrease in initial concentration of A

B. Increase in initial concentration of A

C. Decrease of temperature

D. Increase of temperature

2795. A first order reaction A ? B occurs in an isothermal porous catalyst pellet of spherical shape. If the concentration of A at the centre of the pellet is much less than at the external surface, the process is limited by__________________?
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A. External mass transfer

B. Reaction

C. Diffusion within the pellet

D. None of the above

2796. What is the order of a chemical reaction of the bellow figure, if the rate of formation of C, increases by a factor of 2.82 on doubling the concentration of A and increases by a factor of 9 on trebling the concentration of B ?
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A. 4-May

B. 2-May

C. 4-Jul

D. 7/2

2797. 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 ?
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A. t ? 1/an + 1

B. t ? an

C. t ? 1/an 1

D. t ? 1/an

2798. If n is the order of reaction, then unit of rate constant is _________________?
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A. 1/(time)(concentration)n 1

B. None of these

C. (Time)-1 (concentration)n 1

D. (Time)n 1 (concentration)

2799. A first order homogeneous reaction of the type X ? Y ? Z (consecutive reaction) is carried out in a CSTR. Which of the following curves respectively show the variation of the concentration of X, Y and Z with time ?
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A. II, III, I

B. I, II, III

C. III, I, II

D. III, II, I

2800. According to the law of mass action, the rate of reaction is directly proportional to the__________________?
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A. Nature of the reactants

B. Volume of the reaction vessel

C. Molar concentration of the reactants

D. Equilibrium constant

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