Practice Test: Question Set - 14
1. Pick out the correct statement.
- (A) A catalyst does not change AH of the reaction
- (B) A catalyst changes the equilibrium point
- (C) Law of mass action was suggested by Le-Chatelier
- (D) The difference between the energy of reactants
and that of the products is the activation energy
2. If pore diffusion is the controlling step in a solid catalyzed reaction, the catalyst
- (A) Porosity is very important
- (B) Porosity is of less importance
- (C) Internal surface area is utilized efficiently
- (D) None of these
3. For identical flow rate, feed composition and for elementary first order reactions, 'N' equal sized mixed reactors in series with a total volume 'V' gives the same conversion as a single plug flow reactor of volume 'V' for constant density systems. This is true, when the value of 'N' is
- (A) 1
- (B) > 1
- (C) ∞
- (D) ≥ 1
4. Which of the following does not produce a change in the value of rate constant of a reaction?
- (A) Pressure
- (B) Temperature
- (C) Concentration and catalyst
- (D) None of these
5. The energy of activation of a chemical reaction:
- (A) Is same as heat of reaction at constant pressure
- (B) Is the minimum energy which the molecules must
have before the reaction can take place
- (C) Varies as fifth power of the temperature
- (D) Both (b) and (c)
6. Inversion of cane sugar is an example of
- (A) Unimolecular reaction with first order
- (B) Bimolecular reaction with second order
- (C) Bimolecular reaction with first order
- (D) Unimolecular reaction with second order
7. If the rate of a chemical reaction becomes slower at a given temperature, then the
- (A) Initial concentration of the reactants remains constant
- (B) Free energy of activation is lower
- (C) Entropy changes
- (D) Free energy of activation is higher
8. A pulse tracer is introduced in an ideal CSTR (with a mean residence time I) at time, t = 0. The time taken for the exit concentration of the tracer to reach half of its initial value will be
- (A) 2τ
- (B) 0.5τ
- (C) τ/0.693
- (D) 0.693τ
9. With increase in the space time of an irreversible isothermal reaction being carried out in a P.F. reactor, the conversion will
- (A) Increase
- (B) Decrease
- (C) Remain same
- (D) Data in insufficient; can't be predicted
10. Integral method for analyzing the kinetic data is used
- (A) When the data are scattered
- (B) For testing specific mechanisms with simple rate expressions
- (C) Both (a) and (b)
- (D) None of these
11. Helium-mercury method is used for the measurement of the __________ of the catalyst.
- (A) Surface area
- (B) Porosity
- (C) Pore volume
- (D) Both (b) & (c)
12. As the chemical reaction proceeds, the rate of reaction
- (A) Increases
- (B) Decreases
- (C) Remain same
- (D) May increase or decrease depending on the type of reaction
13. When a high liquid hold up is required in a reactor for gas liquid reaction, use __________ column.
- (A) Packed
- (B) Spray
- (C) Tray
- (D) Bubble
14. Pick out the wrong statement.
- (A) 'Hold back' is defined as the fraction of
material that stays longer than the mean residence time
- (B) Study of non-ideal flow reactor is done experimentally by
stimulus-response technique
- (C) For studying a chemical reaction, it is desirable to monitor the
reactants during initial stages and the products during the final stages of
reaction
- (D) A batch reactor cannot be used to study the kinetics of catalytic
reaction
15. For any reaction, we may write conversion as a function of
- (A) Time
- (B) Temperature
- (C) Concentration
- (D) All (a), (b) & (c)
Next Tests: