Practice Test: Question Set - 33
1. From Arrhenius law, a plot of loge K versus 1/T gives a straight line with a slope of (-E/R). The unit of E/R is
- (A) k cal
- (B) k cal/°K
- (C) °K
- (D) k cal. °K
2. Effective diffusivity (DE) in a catalyst pellet is related to molecular diffusivity (DN) and Knudsen diffusivity (DK) as
- (A) DE = DM + DK
- (B) 1/DE = 1/DN + DK
- (C) DE = DM . DE
- (D) DE = DN/DE
3. During manufacture of H2SO4, the oxidation of SO2 to SO3 by oxygen is an endothermic reaction. The yield of SO3 will be maximized, if the
- (A) Temperature is increased
- (B) Pressure is reduced
- (C) Temperature is increased and pressure is reduced
- (D) Temperature is reduced and pressure is increased
4. Which of the following is not a chemical step in a fluid solid catalytic reaction?
- (A) Surface chemical reaction
- (B) Adsorption
- (C) Desorption
- (D) None of these
5. An isothermal irreversible reaction is being carried out in an ideal tubular flow reactor. The conversion in this case will __________ with decrease in space time.
- (A) Increase
- (B) Increase exponentially
- (C) Decrease
- (D) Remain unchanged
6. The half life period of a first order reaction is
- (A) Always the same irrespective of the reaction
- (B) Dependent on initial concentration of the reactants
- (C) Proportional to the initial concentration of reactants
- (D) Half the specific rate constant
7. The most suitable reactor for carrying out an auto-thermal reaction is a
- (A) Batch reactor
- (B) CSTR
- (C) Semi-batch reactor
- (D) Plug-flow reactor
8. Conversion increases with increase in temperature in case of a/an __________ reaction.
- (A) Autocatalytic
- (B) Irreversible
- (C) Reversible endothermic
- (D) Reversible exothermic
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