71. A catalyst loses its activity due to
72. Which of the following resistances is not involved in a gas phase catalytic (gas- solid) reaction?
73. What is the dispersion number for a plug flow reactor?
74. __________ resistance is not involved in the combustion of a carbon particle.
75. Pick out the wrong statement.
76. The excess energy of reactants in a chemical reaction required to dissociate into products is termed as the __________ energy.
77. Which of the following is used for calcination of limestone and dolomite in industrial practice?
78. The reactions of high molecularity are rare, because
79. Molecularity of a reaction
80. 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 = 40°C. Rate constant at 40°C = 1 min-1; (ΔH) = -40 kJ/mole; ρ = 1000 kg/m3 CP = 4 J/gm.°C; q = 10-3 m3/min (ρ and CP are same for the reactant and product streams). The amount of heat to be removed is
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