Chemical Reaction Engineering problems
- 1. The rate constant of a chemical reaction increases by 100 times when the temperature is increased from 400 °K to 500 °K. Assuming transition state theory is valid, the value of E/R is
Options- A. 8987°K
- B. 9210°K
- C. 8764°K
- D. 8621°K Discuss
Correct Answer: 9210°K
- 2. With decrease in temperature, the equilibrium conversion of a reversible endother-mic reaction
Options- A. decreases
- B. increases
- C. remains unaffected
- D. increases linearly with temperature Discuss
Correct Answer: decreases
- 3. 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
Correct Answer: liquid phase reactions.
- 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 Also asked in: Bank Exams
Correct Answer: 2
- 5. 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
Correct Answer: 2
- 6. 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
Correct Answer: decreases the energy barrier for reaction.
- 7. 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
Correct Answer: all (a), (b) and (c).
- 8. 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). Discuss
Correct Answer: all (a), (b) and (c).
- 9. 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
Correct Answer:
- 10. Radioactive decay follows __________ order kinetics.
Options- A. first
- B. second
- C. third
- D. zero. Discuss
Correct Answer: first
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