Practice Test: Question Set - 17
1. Fractional conversion __________ with increase in pressure for ammonia synthesis reaction i.e., N2 + 3H2 ⇌ 2NH3.
- (A) Increases
- (B) Decreases
- (C) Remains unchanged
- (D) Unpredictable from the data
2. Velocity of a chemical reaction
- (A) Decreases with increase in temperature
- (B) Increases with increase of pressure of reactants for all reactions
- (C) Decreases with increase of reactant concentration
- (D) None of these
3. Which of the following is used for calcination of limestone and dolomite in industrial practice?
- (A) Fluidized bed reactor
- (B) Moving bed reactor
- (C) Fixed bed reactor
- (D) None of these
4. For a __________ order chemical reaction as shown in the bellow figure, the half life period is independent of the initial concentration of the reactant A.
- (A) Zero
- (B) First
- (C) Second
- (D) Third
5. A first order irreversible reaction, A → B is carried out separately in a constant volume as well as in a variable volume reactor for a particular period. It signifies that __________ in the two reactors.
- (A) Both conversion as well as concentration are
same
- (B) Conversion in both will be the same but
concentrations will be different
- (C) Both the conversion as well as concentrations will
be different
- (D) None of these
6. Fluidized bed reactor is characterized by
- (A) Uniformity of temperature
- (B) Comparatively smaller equipment
- (C) Very small pressure drop
- (D) Absence of continuous catalyst regeneration facility
7. Threshold energy in a reaction is equal to the
- (A) Activation energy
- (B) Normal energy of reactants
- (C) Sum of (a) & (b)
- (D) Neither (a) nor (b)
8. The rate expression for the gaseous phase reaction, CO + 2H2 ⇌ CH3OH, is given by as shown in the bellow figure. Which of the following is not possible?
- (A) α = 1, β = 1, γ =1
- (B) α = 1, β = 2, γ = 1
- (C) α = 1/3, β = 2/3, γ = 1/3
- (D) α = 1/2, β = 1, γ = 1/2
9. Which of the following will give maximum gas conversion?
- (A) Fixed bed reactor
- (B) Fluidized bed reactor
- (C) Semi-fluidized bed reactor
- (D) Plug-flow catalytic reactor
10. A liquid decomposes by irreversible first order kinetics and the half life period of this reaction is 8 minutes. The time required for 75% conversion of the liquid will be __________ minutes.
- (A) 4
- (B) 8
- (C) 12
- (D) 16
11. A first order homogeneous reaction of the type X → Y → Z (consecutive reaction) is carried out in a CSTR. Which of the following curves respectively show the variation of the concentration of X, Y and Z with time?
- (A) I, II, III
- (B) III, II, I
- (C) III, I, II
- (D) II, III, I
12. The minimum energy required to allow a chemical reaction to proceed is termed as the 'threshold energy '. Chemical reactions with low activation energy are:
- (A) Always irreversible
- (B) Insensitive to temperature changes
- (C) Mostly irreversible
- (D) Highly temperature sensitive
13. A non-catalytic chemical reaction of the type as shown in the bellow figure is called a __________ reaction.
- (A) Parallel
- (B) Series
- (C) Series-parallel
- (D) None of these
14. Which of the following resistances is not involved in a gas phase catalytic (gas-solid) reaction?
- (A) Ash resistance
- (B) Gas film and pore surface diffusion resistances for reactants
- (C) Surface phenomenon resistance
- (D) Gas film and pore surface diffusion resistances for products
15. In Langmuir treatment of adsorption,
- (A) Whole surface of the catalyst does not have the same activity for
adsorption and there is attraction between the adsorbed molecule
- (B) Whole surface of the catalyst is essentially uniform and the
adsorbed molecule has no effect on the rate of adsorption per site
- (C) All the adsorption does not take place by the same mechanism
- (D) Extent of adsorption is more than one complete monomolecular layer
on the surface
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