Chemical Reaction Engineering – Multiple Choice Questions (MCQs)

1. 1. What is the primary goal of Chemical Reaction Engineering (CRE)?

   • A. To design and operate chemical reactors efficiently
   • B. To synthesize new chemical compounds
   • C. To analyze material properties
   • D. To study heat transfer phenomena

2. 2. What is 'reaction rate'?

   • A. The speed at which reactants are consumed or products are formed
   • B. The amount of product formed
   • C. The energy released during a reaction
   • D. The concentration of reactants

3. 3. What is a 'rate law'?

   • A. An equation that expresses the rate of a chemical reaction in terms of concentrations (or partial pressures) of reactants and products
   • B. A law describing heat transfer
   • C. A law describing mass transfer
   • D. A law describing fluid flow

4. 4. What is the 'reaction order'?

   • A. The power to which the concentration of a reactant is raised in the rate law
   • B. The stoichiometric coefficient
   • C. The reaction temperature
   • D. The activation energy

5. 5. What is the 'rate constant' (k)?

   • A. A proportionality constant in the rate law that reflects the intrinsic speed of the reaction
   • B. The concentration of a reactant
   • C. The reaction temperature
   • D. The activation energy

6. 6. What is 'activation energy' (Ea)?

   • A. The minimum energy required for a chemical reaction to occur
   • B. The energy released during a reaction
   • C. The energy absorbed during a reaction
   • D. The energy of the products

7. 7. What is the Arrhenius equation used for?

   • A. To relate the rate constant to temperature
   • B. To relate concentration to time
   • C. To calculate reaction stoichiometry
   • D. To determine the reaction order

8. 8. What is a 'homogeneous reaction'?

   • A. A reaction that occurs in a single phase
   • B. A reaction that occurs in multiple phases
   • C. A reaction that involves a catalyst
   • D. A reaction that produces solids

9. 9. What is a 'heterogeneous reaction'?

   • A. A reaction that occurs in a single phase
   • B. A reaction that occurs at the interface of two or more phases
   • C. A reaction that involves no catalyst
   • D. A reaction that only produces gases

10. 10. What is a 'Plug Flow Reactor' (PFR)?

    • A. A reactor where fluid flows in a plug-like manner with no axial mixing and complete radial mixing
    • B. A reactor with perfect mixing
    • C. A reactor with stagnant zones
    • D. A reactor used for solid-liquid reactions

11. 11. What is 'conversion' (X_A)?

    • A. The fraction of a reactant that has been consumed in a reaction
    • B. The amount of product formed
    • C. The reaction rate
    • D. The concentration of reactants

12. 12. What is the 'design equation' for a batch reactor?

    • A. t = N_A0 ∫(dX_A / (-r_A * V))
    • B. V = F_A0 / (-r_A)
    • C. V = (F_A0 * X_A) / (-r_A)
    • D. C_A = C_A0 * (1 - X_A)