chemical engineering chemical reaction MCQs – Page 3

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 Review each marked answer and report any item that may be outdated or unclear.

chemical engineering chemical reaction Mcqs

41. A photochemical reaction is _______________ light?
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A. Used to convert heat energy into

B. Accompanied with emission of

C. Catalysed by

D. Initiated by

42. The conversion for a first order liquid phase reaction. A ? B in a CSTR is 50%. If another CSTR of the same volume is connected in series, then the % conversion at the exit of the second reactor will be_____________________?
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A. 60

B. 90

C. 100

D. 75

43. For an isothermal variable volume batch reactor, the following relation is applicable for a first order irreversible reaction?
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A. [CA0/(1 + ?A XA)] (dXA/dt) = k

B. -ln(1 XA) = kt

C. ?A . ln (1 XA) = k . t

D. XA = k . t

44. The E curve for a non-ideal reactor defines the fraction of fluid having age between t and t + dt _____________________?
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A. Averaged over the inlet and outlet

B. At the outlet

C. At the inlet

D. In the reactor

45. An irreversible aqueous phase reaction, A + B ? P, is carried out in an adiabatic mixed flow reactor. A feed containing 4kmole/m3 of each A and B enters the reactor at 8m3 /hr. If the temperature of the exit stream is never to exceed 390 K, what is the maximum inlet feed temperature allowed? Data: Heat of reaction = 50 kJ/mole Density of the reacting mixture = 1000kg/m3 Specific heat of reacting mixture = 2kJ/kg.K The above data can be assumed to be independent of temperature and composition?
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A. 390

B. 190

C. 290

D. 490

46. 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?
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A. Chemical reaction

B. Diffusion through ash layer

C. Either A., B. or C.

D. Film diffusion

47. What is the order of a chemical reaction whose rate is deter-mined by the variation of one concentration term only ?
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A. First

B. Zero

C. Third

D. Second

48. 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 __________________?
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A. 2

B. 1

C. 0

D. 1.5

49. Fluidised bed reactor is characterized by____________________?
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A. Comparatively smaller equipment

B. Uniformity of temperature

C. Absence of continuous catalyst regeneration facility

D. Very small pressure drop

50. In which of the following reactions, the equilibrium will shift to the right, if the total pressure is increased ?
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A. H2 + Cl2 ? 2HCl

B. N2 + O2 ? 2NO

C. N2O4 ? 2 NO2

D. H2 + I2 ? 2HI

51. Kinetics of a solid catalysed reaction can best be studied in a _________________ reactor?
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A. Batch

B. None of these

C. Mixed

D. Plug-flow

52. For the irreversible elementary reactions in parallel as shown in the bellow figure, the rate of disappearance of X is equal to_______________?
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A. CA . K1/2

B. CA (K1 + K2)/2

C. CA . K2/2

D. CA (K1 + K2)

53. In chamber process of sulphuric acid manufacture in industry, the gas phase oxidation of SO2 to SO3 is accomplished by a ______________ reaction ?
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A. Catalytic homogenous

B. Non-catalytic heterogeneous

C. Catalytic heterogeneous

D. Non-catalytic homogeneous

54. The conversion XA and residence time data are collected for zero order liquid phase reaction in a stirred tank reactor. Which of the following will be a straight line ?
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A. XA/(1 XA)Vs ?

B. XA Vs ln ?

C. XA(1 XA)Vs ?

D. XA Vs . ?

55. In a semi-batch reactor _____________________?
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A. Velocity of reaction can be controlled

B. Maximum conversion can be controlled

C. Both the reactants flow counter-currently

D. Residence time is constant

56. Maximum equilibrium conversion for endothermic reaction is obtained at the ______________ temperature?
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A. Highest possible

B. Lowest possible

C. Intermediate

D. Room

57. Following isothermal kinetic data are obtained in a basket type of mixed flow reactor for a porous catalyst. Determine the role of pore diffusion and external mass transfer processes ?
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A. Strong pore diffusion control and mass transfer not controlling

B. Both pore diffusion and mass transfer not controlling

C. Both pore diffusion and mass transfer controlling

D. Mass transfer controlling

58. 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.

59. For the reaction as shown in the bellow figure, the rate of formation of Z is 0.2 gm mole/litre.hr. What is the rate of disappearance of X in gm mole/litre.hr ?
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A. 0.1

B. 0.4

C. 0.2

D. None of these

60. Which of the following holds good for an elementary reaction as shown in the bellow figure ?
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A. The rate of disappearance of Y is equal to the rate of disappearance of X

B. The rate of disappearance of X is equal to the rate of appearance of Z

C. The rate of disappearance of Y is equal to the rate of appearance of Z

D. Three times the rate of disappearance of X is equal to the rate of appearance of Z

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