Practice Test: Question Set - 07
1. Rate of a chemical reaction is independent of the concentration of the reactants for a __________ reaction.
- (A) Zero order
- (B) Third order
- (C) Consecutive
- (D) None of these
2. The rate expression for a heterogeneous catalytic reaction is given by, - rA = K.KA PA(1 + KA.PA + KR.PR), where K is surface reaction rate constant and KA and KR are absorption equilibrium constants of A and R respectively. If KR PR >> (1 + KA PA), the apparent activation energy EA is equal to (given E is the activation energy for the reaction and ΔHR and ΔHA are the activation energies of adsorption of R and A)
- (A) E
- (B) E + ΔHA
- (C) E + ΔHA - ΔHR)
- (D) ΔHA + ΔHR
3. Which of the following is not a unit of reaction rate?
- (A) Moles for med/(surface of catalyst) (time)
- (B) Moles formed/volume of reactor) (time)
- (C) Mole formed/volume of catalyst) (time)
- (D) None of these
4. Which of the following fixes the volume of a batch reactor for a particular conversion and production rate?
- (A) Operating conditions (e.g. pressure and temperature)
- (B) Rate constant
- (C) Density of mixture
- (D) None of these
5. The residence time distribution of an ideal CSTR is
- (A) (1/Ï„) exp (-t/Ï„)
- (B) Ï„ exp (-t/Ï„)
- (C) exp (-t/Ï„)
- (D) (1/Ï„) (-t/Ï„)
6. Limiting reactant in a chemical reaction decides the
- (A) Rate constant
- (B) Conversion
- (C) Reaction speed
- (D) Equilibrium constant
7. __________ catalytic reaction is involved in the thermal cracking of gas oil.
- (A) Homogeneous
- (B) Non-Homogeneous
- (C) Heterogeneous
- (D) Non-Heterogeneous
8. The exit age distribution curve E(t) for an ideal CSTR with the average residence time, Ï„, is given by
- (A) e-t/Ï„
- (B) e-t/Ï„/Ï„
- (C) 1 - e-t/Ï„
- (D) 1 - (e-t/Ï„/Ï„)
9. If ΔG (free energy change) for a chemical reaction is very large and negative, then the reaction is
- (A) Not feasible
- (B) Just feasible
- (C) Very much feasible
- (D) Unpredictable as ΔG is no measure of feasibility of a reaction
10. What is the value of 'n' if the reaction rate of the chemical reaction A → B, is proportional to CAn and it is found that the reaction rate triples, when the concentration of 'A' is increased 9 times?
- (A) 1/2
- (B) 1/3
- (C) 1/9
- (D) 3
11. A reaction which is catalyzed by a base is catalyzed by all substances which have a tendency to
- (A) Lose a proton
- (B) Gain a proton
- (C) Gain an electron
- (D) None of these
12. For all positive reaction orders for a particular duty,
- (A) Mixed reactor is always larger than the plug-flow reactor
- (B) Ratio of the volume of the mixed reactor to that
of the plug-flow reactor decreases with order
- (C) Reactor size is independent of the type of flow
- (D) Density variation during reaction affects design
13. When a catalyst increases the rate of chemical reaction, the rate constant
- (A) Decreases
- (B) Increases
- (C) Remain constant
- (D) Become infinite
14. In which of the following gaseous phase reactions, the equilibrium of the reaction remains unaffected by pressure changes?
- (A) 2O3 ⇌ 3O2
- (B) N2 + O2 ⇌ 2NO
- (C) 2NO2 ⇌ N2O4
- (D) 2SO2 + O2 ⇌ 2SO3
15. What is the order of a chemical reaction whose rate is deter-mined by the variation of one concentration term only?
- (A) Zero
- (B) First
- (C) Second
- (D) Third
Next Tests:
Blogger Comment
Facebook Comment