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Chemical Engineering
Chemical Reaction Engineering
Quiz 2
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Q.1
The decomposition of A into B is represented by the exothermic reaction, A ⇋ 2B. To achieve maximum decomposition, it is desirable to carry out the reaction.
At high P and high T
At low P and high T
At low P and low T
At high P and low T
Q.2
The response curve for a step input signal from a reactor is called C-curve. The variance of C-curve in a 'tanks in series model' comprising of 'm' tanks is equal to
m
1/m
√m
m²
Q.3
Reactions with high activation energy are
Very temperature sensitive
Temperature insensitive
Always irreversible
Always reversible
Q.4
Half life period of a first order irreversible reaction A → B is
K/2
Ln k/2
Ln 2/k
Ln 0.5/k
Q.5
Which of the following is an autocatalytic reaction?
Photochemical reactions
Microbial fermentation reaction
Enzyme fermentation reaction
Ammonia synthesis reaction
Q.6
The energy of activation of a chemical reaction
Is same as heat of reaction at constant pressure
Is the minimum energy which the molecules must have before the reaction can take place
Varies as fifth power of the temperature
Both B and C
Q.7
Backmixing is most predominant in
A well stirred batch reactor
A plug-flow reactor
A single CSTR
CSTR's connected in series
Q.8
Pick out the wrong statement.
In a batch reactor, which is exclusively used for liquid phase reactions; temperature pressure and composition may vary with time
In a semi-batch reactor, one reactant is charged batchwise, while the other reactant is fed continuously
In a continuous flow reactor, uniform concentration can not be maintained throughout the vessel even in a well agitated system
N a continuous flow reactor, both the reactants and the products flow out continuously
Q.9
When the reaction occurs in the diffusion controlled region, the apparent activation energy as measured is only __________ the true value.
Twice
Half
Equal
None of these
Q.10
The importance of diffusion in a catalyst are increased by
Large catalyst particle size
An active surface of the catalyst
Small pore diameter
All of the above
Q.11
In a semi-batch reactor
Velocity of reaction can be controlled
Maximum conversion can be controlled
Both the reactants flow counter-currently
Residence time is constant
Q.12
In a chemical reaction, __________ are conserved.
Ions
Masses
Atoms
Both B & C
Q.13
A reaction in which one of the products of reaction acts as a catalyst is called a/an __________ reaction.
Catalytic
Autocatalytic
Photochemical
None of these
Q.14
The minimum energy required to allow a chemical reaction to proceed is termed as the 'threshold energy '. Chemical reaction with low activation energy are
Always irreversible
Insensitive to temperature changes
Mostly irreversible
Highly temperature sensitive
Q.15
In a semi-batch reactor,
Mixing takes place in axial direction only
Velocity of reaction can be controlled
Condition similar to plug flow reactor exists
Residence time is constant
Q.16
Which of the following is not endothermic in nature?
Combustion of sulphur
Gasification of carbon
Thermal cracking of fuel oil
Steam reforming of naphtha
Q.17
For the non catalytic reaction of particles with surrounding fluid, the same needed to achive the same fractional conversion for particles of different unchanging sizes is proportional to the particle diameter, when the __________ is the controlling resistance.
Film diffusion
Diffusion through ash layer
Chemical reaction
Either A, B or C
Q.18
For reactions in parallel viz A → P (desired product) and A → Q (unwanted product), if the order of the desired reaction is higher than that of the undesired reaction, a
Batch reactor is preferred over a single CSTR for high yield
Tubular reactor is preferred over a single CSTR for high yield
Both A and B
Single CSTR is the most suitable
Q.19
Time required for 50% decomposition of a liquid in an isothermal batch reactor following first order kinetics is 2 minutes. The time required for 75% decomposition will be about __________ minutes.
3
4
6
8
Q.20
Which one is the rate controlling step in a solid-gas non-catalytic reaction occurring at very high temperature?
Pore diffusion
Film diffusion
Ash layer diffusion
Chemical reaction
Q.21
The rate of forward reaction, at chemical equilibrium is____the rate of backward reaction.
More than
Less than
Equal to
Either B or C
Q.22
An endothermic second order reaction is carried out in an adiabatic plug flow reactor. The rate of heat generation is
Maximum at the inlet of the reactor
Maximum at the exit of the reactor
Maximum at the centre of the reactor
Constant throughout the reactor
Q.23
In autocatalytic reactions,
One of the reactants acts as a catalyst
One of the products acts as a catalyst
Catalysts have very high selectivity
No catalyst is used
Q.24
In case of a P.F.R., there
May be lateral mixing of fluid
Should not be any mixing along the flow path
Both A and B
Neither A nor B
Q.25
With increase in the order of reaction (for all positive reaction orders), the ratio of the volume of mixed reactor to the volume of plug flow reactor (for identical feed composition, flow rate and conversion)
Increases
Decreases
Remains same
Increases linearly
Q.26
If the time required to change the concentration of reactant to half its original value is independent of the initial concentration, the order of reaction is
Zero
One
Two
Three
Q.27
Ionic reactions occur in
Solid state only
Liquid state only
Solutions
Any state
Q.28
Catalytic action in a catalytic chemical reaction follows from the ability of catalyst to change the
Activation energy
Equilibrium constant
Heat of reaction
None of these
Q.29
For the non-catalytic reaction of particles with surrounding fluid, the time needed to achieve the same fractional conversion for particles of different but unchanging sizes is proportional to the square of particle diameter, when the __________ is the controlling resistance.
Film diffusion
Diffusion through ash layer
Chemical reaction
Either A, B or C
Q.30
Which of the following is not a theory of homogeneous reaction?
Collision theory and activated complex theory
Chain reaction theory
Radiation hypothesis
None of these
Q.31
Rate of an autocatalytic chemical reaction is a function of
Temperature only
Pressure only
Composition only
All of the above
Q.32
The rate of reaction does not decrease appreciably as the reaction proceeds in case of __________ reactions.
Autocatalytic
Exothermic
Endothermic
Autothermal
Q.33
With increase in temperature, the equilibrium __________ rises in case of endothermic reaction.
Constant
Conversion
Both A & B
Neither A nor B
Q.34
A first order reaction is to be treated in a series of two mixed reactors. The total volume of the two reactors is minimum, when the reactors are
Equal in size
Of different sizes
Of such size that the ratio of their volumes is < 5
None of these
Q.35
Pick out the correct statement.
A catalyst speeds up the forward reaction but slows shown the reverse reaction
Addition of catalyst changes the equilibrium constant
Pressure changes do not change the equilibrium concentrations
The composition of equilibrium is changed by catalyst
Q.36
Design of heterogeous catalytic reactor involves consideration of __________ steps.
Only chemical
Only physical
Both A & B
Neither A nor B
Q.37
In chamber process of sulphuric acid manufacture in industry, the gas phase oxidation of SO₂ to SO₃ is accomplished by a __________ reaction.
Non-catalytic homogeneous
Non-catalytic heterogeneous
Catalytic homogenous
Catalytic heterogeneous
Q.38
For the chemical reaction X → Y, it is observed that, on doubling the concentration of 'X', the reaction rate quadruples. If the reaction rate is proportional to C
x
n
, then what is the value of 'n' ?
4
1/4
16
2
Q.39
Pick out the wrong statement.
Visible radiation provides the necessary activation energy in photochemical reactions
The order and molecularity of a complex reaction may not be the same
For a second order reaction, the slope of the graph/plot between rate and (concentration) is equal to the rate constant (k)
Molecularity of the reaction is always a whole number greater than zero
Q.40
Equilibrium of a chemical reaction as viewed by kinetics is a __________ state.
Dynamic steady
Static steady
Dynamic unsteady
None of these
Q.41
Autocatalytic reactions are best carried out in a
CSTR
CSTR in series
Plug flow reactor
Recycle reactor
Q.42
In Langmuir treatment of adsorption,
Whole surface of the catalyst does not have the same activity for adsorption and there is attraction between the adsorbed molecule
Whole surface of the catalyst is essentially uniform and the adsorbed molecule has no effect on the rate of adsorption per site
All the adsorption does not take place by the same mechanism
Extent of adsorption is more than one complete monomolecular layer on the surface
Q.43
In case of __________ reactions, the reaction rate does not decrease appreciably as the reaction proceeds.
Catalytic
Parallel
Series
Auto catalytic
Q.44
In the gaseous phase ammonia formation reaction (N₂ + 3H₂ ⇋ 2NH₃), the value of the equilibrium constant depends on the
Total pressure of the system
Volume of the reactor
Temperature
Initial concentration of N₂ and H₂
Q.45
When the reaction is dominated by in-traparticle diffusion, the apparent order of reaction (n
D
) as measured is related to the true order (n) as
N
D
= (n + 1)/2
N
D
= n/2
N
D
= n + 1
None of these
Q.46
Carbon particles accummulated on the catalyst used in the gas oil cracking lies in the category of __________ poison.
Deposited
Chemisorbed
Selectivity
Stability
Q.47
The role of a catalyst in a chemical reaction is to change the
Equilibrium constant
Activation energy
Final products
Heat of reaction
Q.48
Pick out the correct statement.
A chemical reaction accompanied by absorption of heat is called an exothermic reaction
A chemical reaction accompanied by evolution of heat is called an endother-mic reaction
The rate constant for a first order reaction does not change on changing the concentration units
Chemical equilibrium state is dynamic in nature
Q.49
Catalyst carriers
Have very high selectivity
Increase the activity of a catalyst
Provide large surface area with a small amount of active material
Inhibit catalyst poisoning
Q.50
The use of space time is preferred over the mean residence time in the design of a/an
Batch reactor
Ideal tubular-flow reactor
Slurry reactor
CSTR
0 h : 0 m : 1 s
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