Practice Test: Question Set - 10
1. Effectiveness factor of a catalyst pellet is a measure of the __________ resistance.
- (A) Pore diffusion
- (B) Gas film
- (C) Chemical reaction
- (D) None of these
2. For the reversible reaction A ⇌ 2B, if the equilibrium constant K is 0.05 mole/liter; starting from initially 2 moles of A and zero moles of B, how many moles will be formed at equilibrium?
- (A) 0.253
- (B) 0.338
- (C) 0.152
- (D) 0.637
3. BET apparatus is used to determine the
- (A) Specific surface of a porous catalyst
- (B) Pore size distribution
- (C) Pore diameter
- (D) Porosity of the catalyst bed
4. The extent of a reaction is
- (A) Different for reactants and products
- (B) Dimensionless
- (C) Depends on the stoichiometric co-efficient
- (D) All of the above
5. A rise in temperature
- (A) Normally tends to increase the reaction rate
- (B) Does not affect a catalyzed reaction
- (C) Does not affect photo-chemical reaction rates
- (D) All (a), (b) and (c)
6. Arrhenius equation represents graphically the variation between the __________ and temperature.
- (A) Rate of reaction
- (B) Frequency factor
- (C) Rate constant
- (D) Activation energy
7. Pick out the wrong statement.
- (A) A catalyst does not alter the final position of equilibrium in a
reversible reaction
- (B) A catalyst initiates a reaction
- (C) A catalyst is specific in reaction
- (D) A catalyst remains unchanged in chemical composition at the end the
reaction
8. For a heterogenous catalytic reaction, A + B → C, with equimole feed of A and B, the initial rate - rA0 is invariant with total pressure. The rate controlling step is
- (A) Surface Kc/(1 + TS)
reaction between absorbed A and B in the gas
phase
- (B) Surface reaction between absorbed A and
absorbed B
- (C) Surface reaction between A in the gas phase and
absorbed B
- (D) Desorption of C
9. Pick out the wrong statement.
- (A) In a first order reaction, A → products; the reaction becomes slower as
it proceeds, because the concentration of A decreases and the rate is
proportional to the concentration of A
- (B) Transition state theory approaches the problem of calculating
reaction rates by concentrating on the idea of activated complexes
- (C) According to the penetration theory, the mass transfer co-efficient
decreases, if the exposure time of an eddy to the solute decreases
- (D) If the rate of an irreversible reaction, A + B → 2C is k.CA.CB,
then the reaction is always elementary
10. The fractional volume change between no conversion and complete conversion, for the isothermal gas phase reaction, 2A → R, is
- (A) 0.5
- (B) -0.5
- (C) 1
- (D) 1.5
11. If 'n' is the order of reaction, then unit of rate constant is
- (A) 1/(time)(concentration)n - 1
- (B) (Time)-1 (concentration)n -
1
- (C) (Time)n - 1 (concentration)
- (D) None of these
12. Half life period of decomposition of a liquid 'A' by irreversible first order reaction is 12 minutes. The time required for 75% conversion of 'A' is __________ minutes.
- (A) 18
- (B) 24
- (C) 6
- (D) 12
13. Kinetics of a solid catalyzed reaction can best be studied in a __________ reactor.
- (A) Batch
- (B) Plug-flow
- (C) Mixed
- (D) None of these
14. For a packed bed reactor; the presence of a long tail in the residence time distribution curve is an indication of:
- (A) Ideal plug flow
- (B) Bypass
- (C) Dead zone
- (D) Chanelling
15. For a tubular reactor with space time 'τ' and residence time 'θ', the following statement holds good.
- (A) τ and θ are always equal
- (B) τ = θ, when the fluid density changes in the reactor
- (C) τ = θ, for an isothermic tubular reactor in which the density of the
process fluid is constant
- (D) τ = θ, for a non-isothermal reactor
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