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Chemical Engineering
Chemical Reaction Engineering
Quiz 8
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Q.1
Specific rate constant for a second order reaction
Is independent of temperature
Varies with temperature
Depends on the nature of the reactants
Both B and C
Q.2
According to Arhenious equation of temperature dependency of rate constant for an elementary reaction
K ∝ √T
K ∝ e
-E/RT
K ∝ T e
-E/RT
None of these
Q.3
Which of the following factors control the deactivation of a porous catalyst pellet?
Decay reactions
Pore diffusion
Form of surface attack by poison
All of the above
Q.4
Velocity of a reaction depends upon the
Nature of the reactants
Concentration of the reactants
Temperature at which the reaction is carried
All of the above
Q.5
The percent conversion of ethanol in the reactor is
100
97.5
95
2.5
Q.6
Fractional conversion __________ for an exothermic reversible chemical reaction, when the temperature is maximum.
Increases
Remains unchanged
Decreases
Unpredictable from the data
Q.7
reactant and product streams). The amount of heat to be removed is
2/3 kW
1kW
5/3 kW
4kW
Q.8
In an exothermic reaction, the energy of the reacting substances as compared to that of products is
More
Less
Same
Either A or B, depends on order of reaction
Q.9
Which of the following is an independent variable for a batch tank reactor with uniform concentration and temperature?
Time
Useful volume of the tank
Diameter of the reactor
None of these
Q.10
A reaction which is catalysed by a base is catalysed by all substances which have a tendency to
Lose a proton
Gain a proton
Gain an electron
None of these
Q.11
The equilibrium constant of a catalytic chemical reaction __________ due to the presence of a catalyst.
Increases
Decreases
Remains unaffected
Unpredictable from the data
Q.12
From Arhenius law, a plot of log
e
K versus 1/T gives a straight line with a slope of (-E/R). The unit of E/R is
K cal
K cal/°K
°K
K cal. °K
Q.13
Collision theory gives the rate constant for bimolecular reaction as
K α √T.e
-E/RT
K α e
E/RT
K α e
-E/RT
None of these
Q.14
The vessel dispersion number (D/μL) for plug flow is
0
500
750
∞
Q.15
Inversion of cane sugar is an example of
Unimolecular reaction with first order
Bimolecular reaction with second order
Bimolecular reaction with first order
Unimolecular reaction with second order
Q.16
Most important characteristics of gas-liquid reactors are the
Specific inter-facial area
Liquid hold-up
Both A and B
None of these
Q.17
Rate constant 'k' and absolute temperature 'T' are related by collision theory (for bimolecular) as
k ∝ T
1.5
k ∝ exp(-E/RT)
k ∝ √T
k ∝ T
Q.18
The ratio of volume of mixed reactor to the volume of P.F.R. (for identical flow rate, feed composition and conversion) for zero order reaction is
∞
0
1
> 1
Q.19
Reaction rate of a first order reaction, which is half completed in 23 minutes will be
0.03 sec⁻¹
0.03 min⁻¹
0.03 hr⁻¹
0.05 min⁻¹
Q.20
The effect of increasing pressure on the gaseous equilibrium of the reaction 2X+3Y ⇋ 3X+2Y indicates that
Pressure has no effect
Backward reaction is favoured
Forward reaction is favoured
None of these
Q.21
In a/an __________ vessel, the fluid enters and leaves following plug flow.
Open
Closed
Open-closed
Close-opened
Q.22
In the fluid catalytic cracker (FCC), the cracking reaction is __________ (i) and the regeneration is ____________ (ii)
(i) exothermic (ii) endothermic
(i) exothermic (ii) exothermic
(i) endothermic (ii) enodthermic
(i) endothermic (ii) exothermic
Q.23
The enzyme which can catalyse the conversion of glucose to ethyl alcohol is
Invertase
Maltase
Diastase
Zymase
Q.24
Vegetable oils are hydrogenated in a __________ reactor.
Slurry
Plug flow
Homogeneous catalytic
None of these
Q.25
For the chemical reaction P → Q, it is found that the rate of reaction doubles as the concentration of 'P' is doubled. If the reaction rate is proportional to C
p
n
, then what is the value of 'n' for this chemical reaction
1
2
3
0
Q.26
__________ explains the mechanism of catalysis.
Activated complex theory
Collision theory
Thermodynamics
None of these
Q.27
Organic catalysts differ from the inorganic catalyst in the sense that the former is
Active at cryogenic temperatures only
Prohibitively costly
Proteinous in nature
Active at very high temperature only
Q.28
For an ideal plug flow reactor, the value of Peclet number is
0
∞
1
10
Q.29
If n = overall order of a chemical reaction. a = initial concentration of reactant. t = time required to complete a definite fraction of the reaction. Then pick out the correct relationship.
T ∝ 1/a
n
T ∝ 1/a
n - 1
T ∝ 1/a
n + 1
T ∝ a
n
Q.30
In solid catalysed reactions the diffusional effects are more likely to affect the overall rate of reaction for
Fast reactions in catalyst of small pore diameter
Fast reaction in catalyst of large pore diameter
Slow reactions in catalyst of small pore diameter
Slow reactions in catalyst of large pore diameter
Q.31
There is no correspondence between stoichiometry and the rate equation in case of a/an __________ reaction.
Elementary
Multiple
Autocatalytic
Non-elementary
Q.32
Which of the following is not a unit of reaction rate?
Moles for med/(surface of catalyst) (time)
Moles formed/volume of reactor) (time)
Mole formed/volume of catalyst) (time)
None of these
Q.33
If the time required for half change is inversely proportional to the square of initial concentration and the velocity depends on the units in which the concentration term is expressed, then the order of reaction is
1
2
3
0
Q.34
If 'n' is the order of reaction, then unit of rate constant is
1/(time)(concentration)
n - 1
(time)
-1
(concentration)
n - 1
(time)
n - 1
(concentration)
None of these
Q.35
For a mixed flow reactor operating at steady state, the rate of reaction is given by
F
A
0
/V - dCsub>A/dt
F
A
0
/V + dCsub>A/dt
F
A
0
/V . Xsub>A
- dCsub>A/dt
Q.36
The catalyst in a second order reversible reaction increases the rate of the forward reaction
And decreases that of backward reaction
And backward reaction equally
Only
To a greater extent than that of the backward reaction
Q.37
For a zero order reaction, the concentration of product increases with the
Increase of reaction time
Increase in initial concentration
Total pressure
Decrease in total pressure
Q.38
The conversion for a first order liquid phase reaction. A → B in a CSTR is 50%. If another CSTR of the same volume is connected in series, then the % conversion at the exit of the second reactor will be
60
75
90
100
Q.39
Overall rate of reaction in a heterogenous catalytic reaction depends upon the mass and energy transfer from the fluid to solid surface and its rate of reaction is usually __________ the concentration of catalyst, if it does not entail a chain mechanism.
Proportional to
Independent of
Inversely proportional to
Proportional to the square of
Q.40
Conversion increases with increase in temperature in case of a an __________ reaction.
Autocatalytic
Irreversible
Reversible endothermic
Reversible exothermic
Q.41
A stirred tank reactor compared to tubular-flow reactor provides
More uniform operating conditions
Permits operation at the optimum temperature for a long reaction time
Higher overall selectivity for a first order consecutive reaction
All of the above
Q.42
In the converter of the contact process for the manufacture of H₂SO₄ the equilibrium conversion of SO₂ __________ (i) __________ with increase in temperature and __________ (ii) __________ with increase in the mole ratio of SO₂ to air.
(i) increases (ii) decreases
(i) decreases (ii) increases
(i) increases (ii) increases
(i) decreases (ii) decreases
Q.43
The reaction A → B is conducted in an isothermal batch reactor. If the conversion of A increases linearly with holding time, then the order of the reaction is
0
1
1.5
2
Q.44
The rate constant of a reaction is a function of the
Time of reaction
Temperature of the system
Extent of reaction
Initial concentration of the reactants
Q.45
With increase in the space time of an irreversible isothermal reaction being carried out in a P.F. reactor, the conversion will
Increase
Decrease
Remain same
Data in insufficient; can't be predicted
Q.46
A photochemical reaction is __________ light.
Initiated by
Accompanied with emission of
Catalysed by
Used to convert heat energy into
Q.47
The rate constant of a first order reaction depends on the
Concentration of the reactant
Temperature
Concentration of the product
Time
Q.48
For all positive reaction orders for a particular duty,
Mixed reactor is always larger than the plug-flow reactor
Ratio of the volume of the mixed reactor to that of the plug-flow reactor decreases with order
Reactor size is independent of the type of flow
Density variation during reaction affects design
Q.49
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.
18
24
6
12
Q.50
What is the value of 'n' if the reaction rate of the chemical reaction A → B, is proportional to C
A
n
and it is found that the reaction rate triples, when the concentration of 'A' is increased 9 times ?
1/2
1/3
1/9
3
0 h : 0 m : 1 s
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