Latest Chemical Engineering MCQs – Chemical Reaction MCQs
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Latest Chemical Engineering MCQs
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Latest Chemical Reaction Mcqs
The most occurred mcqs of Chemical Reaction in past papers. Past papers of Chemical Reaction Mcqs. Past papers of Chemical Reaction Mcqs . Mcqs are the necessary part of any competitive / job related exams. The Mcqs having specific numbers in any written test. It is therefore everyone have to learn / remember the related Chemical Reaction Mcqs. The Important series of Chemical Reaction Mcqs are given below:
The rate of an autocatalytic reaction as shown in the bellow figure, is given by – rA = k . CA . CB. In this case, the__________________?
A. Plot of – rA Vs CA is a straight line with slope k
B. Rate of disappearance of reactant A is maximum, where CA = CB
C. Plot of – rA Vs CA is a hyperbola
D. Both B & C
A stirred tank reactor compared to tubular-flow reactor provides____________________?
A. Higher overall selectivity for a first order consecutive reaction
B. Permits operation at the optimum temperature for a long reaction time
C. More uniform operating conditions
D. All A., B. and C.
Half life period of a first order irreversible reaction A → B is ______________________?
A. ln k/2
B. k/2
C. ln 2/k
D. ln 0.5/k
The value of Steric factor ‘P’ in the equation k = PZeE/RT usually ranges from ______________________?
A. 1.0 to 10-8
B. 0.1 to 0.9
C. 1.1 to 102
D. None of these
‘Unreacted core model’ represents the reaction involving ______________________?
A. Manufacture of carbon disulphide from elements
B. Roasting of sulphide ores
C. Combustion of coal particles
D. None of these
The effectiveness factor for large value of Thiele modulus [L√(K/D1)] of a solid catalysed first order reaction is equal to (where, L = length of the reactor, cm, D1 = diffusion co-efficient, cm2/second) ?
A. 1
B. 1/[L√(K/D1)]
C. L √(K/D1)
D. ∞
For the same residence time, which one will give the maximum conversion ?
A. Two stirred tank (each of 2.5 litres) in series
B. Single stirred tank (v = 5 litres)
C. Stirred tank followed by tubular flow reactor (each of 2.5 litres)
D. Single tubular flow reactor (v = 5 litres)
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_____________________?
A. 90
B. 75
C. 60
D. 100
For a _____________ order reaction, the units of rate constant and rate of reaction are the same ?
A. Zero
B. Second
C. First
D. Fractional
A chemical reaction occurs, when the energy of the reacting molecules is ________________ the activation energy of reaction?
A. Equal to
B. Less than
C. More than
D. Equal to or more than
Space velocity____________________?
A. Is the maximum feed rate per unit volume of reactor for a given conversion
B. Describes the extensive operating characteristics of a tubular flow reactor
C. Is a measure of the ease of the reaction
D. All A., B. and C.
The heat of reaction__________________?
A. Depends on the mechanism of reaction only
B. Depends on the pressure only
C. Depends on both pressure and mechanism of reaction
D. Is independent of the mechanism of reaction
The conversion of a reactant, undergoing a first order reaction, at a time equal to three times the half life of the reaction is ?
A. 0.875
B. 0.425
C. 0.5
D. Data insufficient to calculate
Photo-chemical reactions occur in presence of ___________________?
A. Sunlight
B. Solid catalysts
C. Darkness
D. Monochromatic radiation only
Effectiveness factor E. of a catalyst pellet is defined as, E = (actual rate within pore of the catalyst)/(rate if not snowed by pore diffusion), Effectiveness factor for a first order reaction is given by (where, T = Thiele modulus) ___________________?
A. tan hT/T
B. tan hT/tan T
C. tan T/T
D. None of these
The exit age distribution of a fluid leaving a vessel (denoted by E) is used to study the extent of non-ideal flow in the vessel. The value of ∫∞ 0 E.dt is____________________?
A. ∞
B. 1
C. 0
D. √2π
Molecularity of an elementary reaction, P + Q → R + S is ____________________?
A. 2
B. 1
C. 3
D. 4
The ‘E’ curve for a non-ideal reactor defines the fraction of fluid having age between t and t + dt _____________________?
A. In the reactor
B. At the outlet
C. At the inlet
D. Averaged over the inlet and outlet
For the reaction as shown in the bellow figure, the rate of formation of Z is 0.2 gm mole/litre.hr. What is the rate of disappearance of X in gm mole/litre.hr ?
A. 0.4
B. 0.2
C. 0.1
D. None of these
The conversion XA and residence time data are collected for zero order liquid phase reaction in a stirred tank reactor. Which of the following will be a straight line ?
A. XA Vs . η
B. XA/(1 – XA)Vs η
C. XA Vs ln η
D. XA(1 – XA)Vs η
Which of the following is not a dimension-less group used in catalysis? (Where, D = dispersion co-efficient, cm2/sec.D1 = diffusion co-efficient; cm2/sec L = length of the reactor, cm t = time, sec, v = volumetric flow rate, cm3/sec. V = volume, cm3.) ?
A. Reactor dispersion number (D/vL)
B. Thiele modulus L √(k/D1)
C. Reduced time (vt/V)
D. None of these
Given, 3H2 + CO = CH4 + H2O, KP = 101.84 and, 4H2 + CO2 = CH4 + 2H2O, KP = 101.17 the KP for the reaction CO + H2O = CO2 + H2 is __________________?
A. 103.01
B. 10-3.01
C. 10-0.67
D. 100.67
The sequence in which three CSTR’s of volumes 5, 10 and 15 m3 will be connected in series to obtain the maximum production in a second order irreversible reaction is ____________________?
A. 15, 10, 5
B. 10, 5, 15
C. 5, 10, 15
D. 10, 15, 5
Chemical Heat Transfer Mcqs
Decomposition rate of a liquid ‘X’ which decomposes as per the reaction as shown in the bellow figure is given by________________?
A. (K1 + K2 + K3) CX
B. K1 . CX
C. (K1 + K2) CX
D. (K2 + K3) CX
A first order gaseous phase reaction is catalysed by a non-porous solid. The kinetic rate constant and the external mass transfer co-efficients are k and kg respectively. The effective rate constant (keff) is given by________________?
A. keff = (k+ kg)/2
B. keff = k + kg
C. keff = (kkg)1/2
D. 1/keff = 1/k + 1/kg
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?
A. Chemical reaction
B. Diffusion through ash layer
C. Film diffusion
D. Either A., B. or C.
A chemical reaction occurs when the energy of the reacting molecules is __________________ the activation energy of the reaction?
A. Equal to
B. Less than
C. More than
D. Equal to or more than
Pure A in gas phase enters a reactor 50% of this A is converted to B through the reaction, A → 3B. Mole fraction of A in the exit stream is______________________?
A. 1/4
B. 1/3
C. 1/2
D. 1/5
A second order reaction of the form A + B → C is called a pseudo-first order reaction, when____________________?
A. CA0 > CB0
B. CA0 = CB0
C. CB0 > CA0
D. CB0 ≥ CB0
What is the maximum possible value of FR(mole/sec.) ?
A. 1/2
B. 1/3
C. 2/3
D. 2
Concentration of the limiting reactant (with initial concentration of a moles/litre) after time t is (a-x). Then ‘t’ for a first order reaction is given by____________________?
A. k. t = ln a/(a – x)
B. k. t = ln (a – x)/a
C. k. t = x/a (a – x)
D. k. t = ln a (a – x)/x
A batch reactor is characterised by ____________________?
A. Variation in reactor volume
B. Variation in extent of reaction and properties of the reaction mixture with time
C. Constant residence time
D. Very low conversion
Promoter is added to the catalyst to improve its____________________?
A. Surface area
B. Sensitivity
C. Porosity
D. None of these
Which of the following curves shows the effect of temperature on the extent of gas-solid adsorption at a given pressure ?
A. Freundlich adsorption isotherm
B. Adsorption isobar
C. Langmuir adsorption isotherm
D. None of these
Calcination reaction of limestone (CaCO3 → CaO + CO2) goes to completion in the rotary kiln, because____________________?
A. Of high calcination temperature
B. CO2 escapes continuously
C. CaO is not dissociated
D. CaO is more stable than CaCO3
A catalyst inhibitor____________________?
A. May be useful for suppressing undesirable side reactions
B. Lessens its selectivity
C. Is added in small quantity during the catalyst manufacture itself
D. All A., B. and C.
A batch reactor suffers from following disadvantage ?
A. High labour and handling cost
B. Poor product quality control
C. High shutdown time requirement for emptying, cleaning and refilling
D. All A., B. and C.
Rate of a chemical reaction is independent of the concentration of the reactants for a _________________ reaction?
A. Zero order
B. Consecutive
C. Third order
D. None of these
Which of the following is not a unit of reaction rate ?
A. Moles formed/volume of reactor) (time)
B. Moles for med/(surface of catalyst) (time)
C. Mole formed/volume of catalyst) (time)
D. None of these
The residence time distribution of an ideal CSTR is _____________________?
A. η exp (-t/η)
B. (1/η) exp (-t/η)
C. exp (-t/η)
D. (1/η) (-t/η)
______________ catalytic reaction is involved in the thermal cracking of gas oil ?
A. Homogeneous
B. Heterogeneous
C. Non-Homogeneous
D. Non-Heterogeneous
If ΔG (free energy change) for a chemical reaction is very large and negative, then the reaction is_______________________?
A. Just feasible
B. Not feasible
C. Very much feasible
D. Unpredictable as ΔG is no measure of feasibility of a reaction
A reaction which is catalysed by a base is catalysed by all substances which have a tendency to_______________________?
A. Gain an electron
B. Gain a proton
C. Lose a proton
D. None of these
When a catalyst increases the rate of chemical reaction, the rate constant_____________________?
A. Remain constant
B. Increases
C. Decreases
D. Become infinite
What is the order of a chemical reaction whose rate is deter-mined by the variation of one concentration term only ?
A. Second
B. First
C. Zero
D. Third
Which of the following is the optimum operating condition for an exothermic reversible reaction taking place in a plug-flow reactor ?
A. Temperature should be high in the beginning and decreased towards the end of the reaction
B. Very high temperature should be used throughout the reaction
C. Very low temperature should be used throughout the reaction
D. None of these
The gas phase reaction 2A ⇌ B is carried out in an isothermal plug flow reactor. The feed consists of 80 mole % A and 20 mole % inerts. If the conversion of A at the reactor exit is 50%, then CA/CA0 at the outlet of the reactor is _______________________?
A. 1/3
B. 5/8
C. 2/3
D. 3/8
The preferred reacting system for oxidation of o-xylene to phthalic anhydride is _____________________?
A. Jacketed liquid phase CSTR
B. Multitubular reactor with cooling
C. Jacketed steam heated multitubular reactor
D. Multistage multitubular reactor with interstage cooling
For a zero order reaction, the concentration of product increases with the _____________________?
A. Increase of reaction time
B. Total pressure
C. Increase in initial concentration
D. Decrease in total pressure
The space time is equivalent to the holding time in a steady state mixed reactor for_____________________?
A. Variable fluid density systems
B. Non-isothermal gas reaction
C. Constant fluid density systems
D. Gas reactions with changing number of moles
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 __________________?
A. 0
B. 1.5
C. 1
D. 2
The rate constant of a reaction depends on the __________________?
A. Time of reaction
B. Initial concentration of reactants
C. Temperature of the system
D. Extent of reaction
The enzyme which can catalyse the conversion of glucose to ethyl alcohol is ___________________?
A. Maltase
B. Invertase
C. Diastase
D. Zymase
Chemical Engineering Basics Mcqs
In a CSTR _______________ varies with time ?
A. Concentration
B. Reaction rate
C. Both A. & B.
D. Neither A. nor B.
The rate of a gas phase reaction is given by K . CA . CB. If the volume of the reaction vessel is reduced to l/4th of its initial volume, then the reaction rate compared to the original rate will be _______________ times?
A. 8
B. 16
C. 4
D. 2
A plug-flow reactor is characterized by _____________________?
A. Presence of axial mixing
B. High capacity
C. Presence of lateral mixing
D. Constant composition and temperature of reaction mixture
In which of the following reactions, the equilibrium will shift to the right, if the total pressure is increased ?
A. N2O4 ⇌ 2 NO2
B. N2 + O2 ⇌ 2NO
C. H2 + Cl2 ⇌ 2HCl
D. H2 + I2 ⇌ 2HI
A chemical reaction, A → 3B, is conducted in a constant pressure vessel. Starting with pure A, the volume of the reaction mixture increases 3 times in 6 minutes. The fractional conversion is ___________________?
A. 0.5
B. 0.33
C. 1
D. Data insufficient, can’t be predicted
In the fluid catalytic cracker (FCC), the cracking reaction is _____________ (i) and the regeneration is _______________ (ii) _______________?
A. (i) exothermic (ii) exothermic
B. (i) exothermic (ii) endothermic
C. (i) endothermic (ii) endothermic
D. (i) endothermic (ii) exothermic
Effectiveness factor of a catalyst pellet is a measure of the _________________ resistance?
A. Pore diffusion
B. Chemical reaction
C. Gas film
D. None of these
BET apparatus is used to determine the ___________________?
A. Specific surface of a porous catalyst
B. Pore diameter
C. Pore size distribution
D. Porosity of the catalyst bed
A rise in temperature ______________________?
A. Does not affect a catalysed reaction
B. Normally tends to increase the reaction rate
C. Does not affect photo-chemical reaction rates
D. All A., B. and C.
If ‘n’ is the order of reaction, then unit of rate constant is _________________?
A. 1/(time)(concentration)n – 1
B. (Time)n – 1 (concentration)
C. (Time)-1 (concentration)n – 1
D. None of these
Kinetics of a solid catalysed reaction can best be studied in a _________________ reactor?
A. Plug-flow
B. Batch
C. Mixed
D. None of these
For a tubular reactor with space time ‘η’ and residence time ‘ζ’, the following statement holds good ?
A. η = θ, when the fluid density changes in the reactor
B. η and θ are always equal
C. η = θ, for an isothermic tubular reactor in which the density of the process fluid is constant
D. η = θ, for a non-isothermal reactor
The catalyst in a first order chemical reaction changes the_________________?
A. Heat of reaction
B. Activation energy
C. Heat of formation of the product
D. Equilibrium constant
In chamber process of sulphuric acid manufacture in industry, the gas phase oxidation of SO2 to SO3 is accomplished by a ______________ reaction ?
A. Non-catalytic heterogeneous
B. Non-catalytic homogeneous
C. Catalytic homogenous
D. Catalytic heterogeneous
For a tubular flow reactor with uniform concentration and temperature, the independent variable is___________________?
A. Diameter
B. Length
C. Time
D. None of these
Differential method for analysing the kinetic data is used ___________________?
A. For testing complicated mechanisms
B. When rate expressions are very simple
C. When the data are scattered
D. None of these
Which of the following is not endothermic in nature ?
A. Combustion of sulphur
B. Thermal cracking of fuel oil
C. Gasification of carbon
D. Steam reforming of naphtha
The reaction in which one of the products of reaction acts as a catalyst is called a/an ______________ reaction?
A. Photochemical
B. Biochemical
C. Catalytic
D. Autocatalytic
Chemical Reaction Mcqs
Oil is hydrogenated using nickel catalyst in a __________________ reactor?
A. Fluidised bed
B. Slurry
C. Batch
D. Fixed bed
Rate of an autocatalytic chemical reaction is a function of ___________________?
A. Pressure only
B. Temperature only
C. Composition only
D. All A., B. and C.
The reactions with low activation energy are _____________________?
A. Slow
B. Always spontaneous
C. Fast
D. Non-spontaneous
A reaction which is catalysed by an acid is also catalysed by any substance, which has a tendency to _________________?
A. Lose a proton
B. Lose an electron
C. Gain a proton
D. None of these
Chemical kinetics can predict the _______________ of a chemical reaction?
A. Rate
B. Feasibility
C. Both of the above
D. Neither of the above
The reaction in which the rate equation corresponds to a stoichiometric equation, is called a/an _______________ reaction?
A. Elementary
B. Parallel
C. Non-elementary
D. Autokinetic
Reaction rate of a first order reaction, which is half completed in 23 minutes will be _________________?
A. 0.03 hr-1
B. 0.03 min-1
C. 0.03 sec-1
D. 0.05 min-1
A typical example of an exothermic reversible reaction conducted at high pressure in industry is____________________?
A. Dehydration of ethanol
B. Reformation of methane
C. Methanol synthesis
D. Polymerisation of ethylene
Inversion of cane sugar is an example of ______________________?
A. Bimolecular reaction with second order
B. Unimolecular reaction with first order
C. Bimolecular reaction with first order
D. Unimolecular reaction with second order
A pulse tracer is introduced in an ideal CSTR (with a mean residence time I) at time, t = 0. The time taken for the exit concentration of the tracer to reach half of its initial value will be__________________?
A. 2η
B. η/0.693
C. 0.5η
D. 0.693η
Integral method for analysing the kinetic data is used _____________________?
A. For testing specific mechanisms with simple rate expressions
B. When the data are scattered
C. Both A. and B.
D. None of these
As the chemical reaction proceeds, the rate of reaction ___________________?
A. Remain same
B. Decreases
C. Increases
D. May increase or decrease depending on the type of reaction
Higher free energy of activation of a chemical reaction (at a given temperature) implies ____________________?
A. Slower rate of reaction
B. Higher equilibrium conversion
C. Higher rate of reaction
D. Both B. and C.
What is the order of a chemical reaction of the bellow figure, if the rate of formation of ‘C’, increases by a factor of 2.82 on doubling the concentration of ‘A’ and increases by a factor of 9 on trebling the concentration of ‘B’ ?
A. 7/2
B. 5/2
C. 7/4
D. 5/4
The optimum performance for reactors operating in parallel is obtained when the feed stream is distributed in such a way, that the_________________?
A. Space time for each parallel line is same
B. Larger reactors have more space time compared to smaller ones
C. Space time for parallel lines is different
D. None of these
A first order reaction requires two equal sized CSTR. The conversion is____________________?
A. More when they are connected in parallel
B. More when they are connected in series
C. Less when they are connected in series
D. Same whether they are connected in series or in parallel
6 gm of carbon is burnt with an amount of air containing 18 gm oxygen. The product contains 16.5 gms CO2 and 2.8 gms CO besides other constituents. What is the degree of conversion on the basis of disappearance of limiting reactant ?
A. 75%
B. 95%
C. 100%
D. 20%
Which of the following is not a theory of homogeneous reaction ?
A. Collision theory and activated complex theory
B. Radiation hypothesis
C. Chain reaction theory
D. None of these
The reaction between oxygen and organic material is a/an _____________ reaction?
A. Exothermic
B. Biochemical
C. Endothermic
D. Photochemical
Most important characteristics of gas-liquid reactors are the________________?
A. Liquid hold-up
B. Specific inter-facial area
C. Both A. and B.
D. None of these
The rate constant of a chemical reaction increases by 100 times when the temperature is increased from 400 °K to 500 °K. Assuming transition state theory is valid, the value of „E/R’ is __________________?
A. 8764°K
B. 9210°K
C. 8987°K
D. 8621°K
For a first order chemical reaction in a porous catalyst, the Thiele modulus is 10. The effectiveness factor is approximately equal to ____________________?
A. 1
B. 0
C. 0.1
D. 0.5
The catalytic converter for conversion of SO2 to SO3 by contact process should have a feed with SO2 content between___________________?
A. 12-15 %
B. 7-10 %
C. 2-5 %
D. 20-25 %
In a semi-batch reactor _____________________?
A. Velocity of reaction can be controlled
B. Residence time is constant
C. Both the reactants flow counter-currently
D. Maximum conversion can be controlled
Find a mechanism that is consistent with the rate equation and reaction given below ?
2A + B → A2B, ( – rA) = k.CA.CB
A. A + B → AB; AB + A → A2B
B. A + B ⇌ AB; AB + A → A2B
C. A + A → AA; AA + B → A2B
D. A + A ⇌ AA; AA + B → A2B
The conversion for a second order, irreversible reaction (constant volume) as shown in the bellow figure, in batch mode is given by______________?
A. (k2 . CA0 . t)2/ (1 + k2 . CA0 . t)
B. (k2 . CA0 . t)/ (1 + k2 . CA0 . t)
C. 1/(1 + k2 . CA0 . t)
D. (k2 . CA0 . t)/ (1 + k2 . CA0 . t)2
Shift conversion reaction_________________?
A. Is non-catalytic
B. Converts CO to CO2 with steam
C. Converts N2 and H2 into NH3
D. Is highly exothermic
Velocity of a chemical reaction___________________?
A. Decreases with increase of reactant concentration
B. Increases with increase of pressure of reactants for all reactions
C. Decreases with increase in temperature
D. None of these
Fluidised bed reactor is characterized by____________________?
A. Uniformity of temperature
B. Very small pressure drop
C. Comparatively smaller equipment
D. Absence of continuous catalyst regeneration facility