Engineering/Chemical Engineering Mcq Question Set 9 Sample Test,Sample questions

Question:
 For the parallel reaction, A→B and A→C, if B is the desired product and the reaction A→B is of positive order n1 and C is the undesired product and the reaction A→C is of negative order n2, then increasing the concentration of A _____

1.Decreases desired product selectivity

2. Increases desired product selectivity

3. Initially increases and then decreases desired product selectivity

4. Does not affect desired product selectivity


Question:
 For very low conversion, the value of Damkohler number is ____

1. ≤0.1

2.>10

3. ≥0.1

4.= 10


Question:
 In terms of conversion, half life is the time taken for ____

1.50% conversion

2.75% conversion

3.20% conversion

4. 30% conversion


Question:
 Langmuir Hinshelwood kinetics is followed by the reaction:

1. Formation of hydrogen bromide

2.Vapor phase decomposition of ethanal

3. Cis-trans isomerization

4. Reversible catalytic decomposition of isopropylbenzene


Question:
 Selectivity in parallel reactions is defined as the ratio of___

1. Moles of desired product formed to the moles of undesired material formed

2.Moles of undesired product formed to the moles of desired material formed

3.Moles of product formed to the moles of reactant consumed

4.Moles of reactant consumed to the moles of product formed


Question:
 State true or false.
A variable volume reactor is the one in which the reaction proceeds by a change in number of moles at a given pressure and temperature.

1.True

2.False

3.all of the above

4.None of the mentioned


Question:
 State true or false.
Autocatalytic reactions are single order reactions.

1.True

2.False

3.all of the above

4.None of the mentioned


Question:
 The mlecularity of the following single step reaction is ____
aA + bB → pP

1.a+b-p

2.a+b+p

3. a+b

4. a-p


Question:
 The reaction yield is defined as the ratio of ____

1.Moles of reactant reacted to the moles of product formed

2.Moles of product formed to the moles of reactant reacted

3.Moles of desired product formed to the moles of undesired material formed

4. Moles of product formed to the moles of reactant fed


Question:
 What is the mole balance of a component in a CSTR? (Where F0 is the molar flowrate of reactant entering and F is the exit molar flowrate)

1.F0 = FX + F

2.F0 = FX + F0

3.F0 = F0X + F

4. F0 = X + F


Question:
 Which of the following reactions follows elementary rate law?

1.Formation of hydrogen bromide

2.Vapor phase decomposition of ethanal

3. Cis-trans isomerization

4.Reversible catalytic decomposition of isopropylbenzene


Question:
An example of autocatalytic reaction is ____

1. Ammonia formation reaction

2. Hydrogen peroxide decomposition reaction

3. Reaction of permanganate with oxalic acid

4.Oxidation of copper


Question:
Arrhenius first suggested the temperature dependence of the rate constant.

1. True

2. False

3.all of the above

4.None of the mentioned


Question:
Autocatalytic reactions are the ones in which ____

1.One of the products poisons the catalyst

2.There is no catalyst employed

3. Only one reactant is involved

4.One of the products catalyses the reaction


Question:
For a zero order reaction, the slope of t0.5 and CAo is ____

1. 2

2.3

3. 1

4. 0


Question:
For all orders of reaction except the first order, half life is related to initial concentration as ____

1.t0.5 α CAon

2. t0.5 α CAo1-n

3. t0.5 α CAo2n

4.t0.5 α CAo


Question:
For the parallel reaction, A→B of order n1 and A→C of order n2, if B is the desired product, then which of the following reactor/ combination of reactors is used if n1 > n2?

1.CSTR

2. CSTR followed by Bubbling bed reactor

3.PFR

4.CSTR followed by PFR


Question:
For the parallel reaction, A→B, represented as (-rA) = k1CA5 and A→C represented as (-rA) = k2CA3, theideal reactor preferred is ____

1.CSTR

2.CSTRs in parallel

3.CSTRs in series

4.PFR


Question:
For the reaction A → 2R containing 50% moles initially, the value of εA is ____

1.1

2.0.75

3.0.5

4. 0.9


Question:
For the reaction A → 4R, the value of εA is ____

1. -3

2. 3

3.4

4.2


Question:
Hydrogenation of oil is an example of ___________ reactor

1.Homogeneous

2. Heterogeneous

3.Autocatalytic

4.Insufficient data


Question:
If t0.5 = 100 minutes and initial concentration is 10, then the order of the reaction is ____

1.4

2. -1

3.-2

4.1


Question:
If the reactions A→B and A→C are represented as (-rA) = k1CA3 and (-rA) = k2CA6 of activation energies 130 and 150 J/ mol, then which of the following is the right selection of process parameters to increase selectivity of B?

1. CSTR, High temperature

2.PFR, High temperature

3.CSTR, Low temperature

4.PFR, Low temperature


Question:
If the total pressure for reaction is initially is 2 atm and the pressure is changed to 3 atm for the reaction to occur, then the value of (PA – PA0) for the reaction N2O → N2 + 0.5O2 is ____

1. -2

2.2

3.-1

4. 1


Question:
Molecularity is _____value and order is ______ value.

1.an integer, a fractional

2.a fractional, an integer

3.both fractional

4. both integers


Question:
Molecularity refers to an elementary reaction.

1.True

2.False

3.all of the above

4.None of the mentioned


Question:
Reaction corresponding to stoichiometric equation is called ______

1.Non-elementary

2.Elementary

3. Heterogeneous

4.Homogeneous


Question:
State true or false.
An autocatalytic reaction is represented as A + R → R + R where, A is a reactant and R formed as the product catalyses the reaction.

1. True

2.False

3.all of the above

4.None of the mentioned


Question:
State true or false.
Constant volume system means that the volume of reactor is constant.

1.True

2. False

3.all of the above

4.None of the mentioned


Question:
State true or false.
For a second order reaction, t.0.5 is directly proportional to the initial concentration.

1.True

2.False

3.all of the above

4.None of the mentioned


Question:
State true or false.
For different sized CSTRs in series, the best system is the one having a minimum volume for a specific conversion.

1. True

2.False

3.all of the above

4.None of the mentioned


Question:
State true or false.
It is preferable to use a number of CSTRs in series to achieve a specific conversion than a single CSTR.

1.True

2. False

3.all of the above

4.None of the mentioned


Question:
The autocatalyst in microbial fermentation reactions is:

1.Organic feed

2.Microbes

3. Enzyme

4. Product chemical


Question:
The overall order of reaction for –rA = kCA0.7CB1.3 is _______

1.0

2. 1

3. 2

4. 3


Question:
The overall reaction order for A + B → C + D is two. It implies that ______

1.reaction may be non-elementary and molecularity is two

2. reaction may be elementary and molecularity is two

3. reaction is non-elementary and molecularity is two

4. reaction is elementary and molecularity is two


Question:
The rate constant for a first order reaction depends on _____

1.Pressure

2. Temperature

3.Concentration

4. Time


Question:
The reaction H2 + Br2 → 2HBr proceeds via which mechanism?

1. Free-radical

2.Ionic substitution

3.Elimination

4. Pericyclic


Question:
The reaction rate of a bimolecular reaction at 300K is 10 times the reaction rate at 150K. Calculate the activation energy using collision theory.

1. 4928 J/mol

2.5164 J/mol

3.3281 J/mol

4. 1296 J/mol


Question:
The slope of the line in the graph gives the _____

1. Activation energy

2.Rate constant

3. Frequency factor

4. Insufficient data


Question:
The units of rate constant of nth order is ______

1. time-1

2. concentration(n-1)

3. time-1 concentration(1-n)

4. time-1 concentration(n-1)


Question:
Value of m to obtain the collision theory relation for temperature dependency of rate constant is _____

1.1

2. 0

3. -1

4. 0.5


Question:
What is the relative rate of reaction for the given reaction.
2A + 9B → 7C + 4D

1.–rA = -9rB=7rC=–4rD

2.–rA =-rB/9=rC/7=rD/4

3.–rA =-rB/9=7rC=4rD

4.–rA = 9rB=-7rC=–4rD


Question:
What is the slope of the plot of ln (t0.5) and ln (CAo)? (Where n is the reaction order)

1.1-n

2.2-n

3. n

4. n2


Question:
Which of the following constants is a type of equilibrium constant?

1.Dissociation constant

2.Association constant

3.Solubility

4.Decay constant


Question:
Which of the following does not hold true for gas-solid catalyzed reactions?

1.Rate law is preferably written in terms of partial pressures

2.Rate law is preferably written in terms of concentrations

3.Rate law can be written only in terms of partial pressures

4.Rate law can be written only in terms of concentrations


Question:
Which of the following is true for fluidized catalytic beds?

1.They cannot be used for multi-phase chemical reactions

2. The bulk density is a function of the flow rate through the bed

3. They come under the category of batch reactors

4. There is no pressure drop


Question:
Which of the following is true for the rate law of a reversible reaction?

1.It reduces to irreversible form when product concentration is zero

2.It satisfies thermodynamic relationships at all times

3.Rate law can be written only in terms of partial pressures

4. Rate law can be written only in terms of concentrations


Question:
Which of the following reactors is used for carrying out autocatalytic reactions?

1.CSTR

2.PFR

3.Batch reactor

4. A combination of CSTR and PFR.


Question:
Which of the following represents constant volume system?

1.C + O2 → CO2

2.CO + H2O → CO2 + H2

3.N2 + 3H2 → 2NH3

4.SO2 + 0.5O2 → SO3


Question:
Which theory is the basis for Arrhenius equation?

1.Collision theory

2.Kinetic theory of gases

3.Ideal gas law

4. Charles and Boyles law


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