Discussion
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- Question
A catalyst loses its activity due to
Options- A. loss in surface area of the active component.
- B. agglomeration of metal particles caused by thermal sintering of the solid surface.
- C. covering of the catalytic active sites by a foregin substance.
- D. all (a), (b) and (c).
- Correct Answer
- all (a), (b) and (c).
- 1. For a zero order chemical reaction, the
Options- A. half life period is directly proportion to the initial concentration of the reac-tants.
- B. plot of products concentration with time is a straight line through the origin.
- C. products concentration increases linerarly with time.
- D. all (a), (b) and (c). Discuss
- 2. The reason why a catalyst increases the rate of reaction is that, it
Options- A. decreases the energy barrier for reaction.
- B. increases the activation energy.
- C. decreases the molecular collision diameter.
- D. none of these. Discuss
- 3. If the time required to complete a definite fraction of reaction varies inversely as the concentration of the reactants, then the order of reaction is
Options- A. 0
- B. 1
- C. 2
- D. 3 Discuss
- 4. The dimensions of rate constant for reaction 3A → B are (l/gm mole)/min. Therefore the reaction order is
Options- A. 0
- B. 1
- C. 2
- D. 3 Discuss
- 5. A batch reactor is suitable for
Options- A. achieving cent percent conversion of reactants into products.
- B. large scale gaseous phase reactions.
- C. liquid phase reactions.
- D. obtaining uniform polymerisation products in highly exothermic reactions. Discuss
- 6. For an isothermal variable volume batch reactor, the following relation is applicable for a first order irreversible reaction.
Options- A. XA = k . t
- B.
- C. -ln(1 - XA) = kt
- D. ?A . ln (1 - XA) = k . t Discuss
- 7. Radioactive decay follows __________ order kinetics.
Options- A. first
- B. second
- C. third
- D. zero. Discuss
- 8. 'If the catalyst pore size is small in comparison with the mean free path, collisions with the pore wall controls the process'. The diffusivity under this condition is called 'Knudsen diffusivity', which is affected by the
Options- A. pressure
- B. temperature
- C. both (a) & (b)
- D. neither (a) nor (b) Discuss
- 9. In an exothermic chemical reaction, the reactants compared to the products have
Options- A. higher temperature
- B. more energy
- C. less energy
- D. same energy. Discuss
- 10. Which of the following is the most suitable for very high pressure gas phase reaction?
Options- A. Batch reactor
- B. Tubular flow reactor
- C. Stirred tank reactor
- D. Fluidised bed reactor Discuss
Chemical Reaction Engineering problems
Search Results
Correct Answer: all (a), (b) and (c).
Correct Answer: decreases the energy barrier for reaction.
Correct Answer: 2
Correct Answer: 2
Correct Answer: liquid phase reactions.
Correct Answer:
Correct Answer: first
Correct Answer: temperature
Correct Answer: more energy
Correct Answer: Tubular flow reactor
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