chemical-engineering-chemical-reaction-engineering Related Question Answers

51. Which of the following will favour the reverse reaction in a chemical equilibrium reaction ?





52. Conversion increases with increase in temperature in case of a an __________ reaction.





53. Effective diffusivity (DE) in a catalyst pellet is related to molecular diffusivity (DN) and Knudsen diffusivity (DK) as




54. A photochemical reaction is __________ light.





55. In a/an __________ reactor, there is exchange of heat with the surroundings with sizeable temperature variation.





56. 'Unreacted core model' represents the reaction involving





57. First FM (Frequency Modullation) Radio Station in Kerala?





58. If a solid-gas non-catalytic reaction occurs at very high temperature, the rate controlling step is the __________ diffusion.





59. The units of frequency factor in Arhenious equation





60. Which of the following is not a chemical step in a fluid solid catalytic reaction ?





61. Fifth generation computers are likely to exhibit?





62. At a given temperature, K1, K2 and K3 are equilibrium constants for the following reactions 1, 2, 3 respectively. CH4(g) + H2O(g) CO(g) + 3H2(g), CO(g) + H2O(g) CO2(g) + H2(g) CH4(g) + 2H2O(g) CO2(g) + 4H2(g) Then K1, K2 and K3 are related as:





63. In case of __________ reactions, the reaction rate does not decrease appreciably as the reaction proceeds.





64. For nearly isothermal operation involving large reaction time in a liquid-phase reaction, the most suitable reactor is a __________ reactor.





65. What is the Thiele modulus of the solid catalysed first order reaction, , if the pore diffusion offers negligible resistance to reaction ?





66. B.E.T. method can be used to determine the __________ of a porous catalyst.





67. Rate constant for a first order reaction does not depend upon reaction time, extent of reaction and the initial concentration of reactants ; but it is a function of reaction temperature. In a chemical reaction, the time required to reduce the concentration of reactant from 100 gm moles/litre to 50 gm moles/litre is same as that required to reduce it from 2 gm moles/litre to 1 gm mole/litre in the same volume. Then the order of this reaction is





68. Which of the following is an independent variable for a batch tank reactor with uniform concentration and temperature ?





69. For reactions in parallel viz A P (desired product) and A Q (unwanted product), if the order of the desired reaction is higher than that of the undesired reaction, a





70. For a gaseous phase reaction, rate of reaction is equal to K. CA . CB. If the volume of the reactor is suddenly reduced to l/4th of its initial volume, then the rate of reaction compared to the original rate will be __________ times.





71. In a reversible chemical reaction having two reactants in equilibrium, if the concentration of the reactants are doubled, then the equilibrium constant will





72. The equilibrium constant of a catalytic chemical reaction __________ due to the presence of a catalyst.





73. The rate constant of a chemical reaction increases by increasing the




74. The catalytic activity of enzymes is due to their capacity to lower the __________ energy.





75. A first order reaction requires two unequal sized CSTR. Which of the following gives higher yield ?




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