Chemical Reaction MCQs

Option A: (1/k) ln C0/C

Option B: (1/k) ln C/C0

Option C: k ln C0/C

Option D: k ln C/C0

Correct Answer: (1/k) ln C0/C ✔

Option A: Decreases

Option B: Increases

Option C: Increases linearly

Option D: Remain same

Correct Answer: Decreases ✔

Option A: The time required to process one reactor volume of feed (measured at specified conditions) is

Option B: Three reactor volumes of feed can be processed every hour

Option C: It takes three hours to dump the entire volume of the reactor with feed

Option D: Conversion is cent per cent after three hours

Correct Answer: A. The time required to process one reactor volume of feed (measured at specified conditions) is
3 hours ✔

Option A: (K1 + K1) CX

Option B: (K1 + K2+K3) CX

Option C: K1CV – K2CX

Option D: (K1 – K2) CX

Correct Answer: C. K1CV – K2CX ✔

Option A: 2/3 kW

Option B: 1 kW

Option C: 5/3 kW

Option D: 4 kW

Correct Answer: 5/3 kW ✔

Option A: t ∝ 1/an

Option B: t ∝ 1/an – 1

Option C: t ∝ 1/an + 1

Option D: t ∝ an

Correct Answer: t ∝ 1/an ✔

Option A: High pressure batch reactor

Option B: Atmospheric pressure tank reactor

Option C: High pressure tubular reactor

Option D: Atmospheric pressure CSTR

Correct Answer: High pressure batch reactor ✔

Option A: P.F. reactors in series

Option B: CSTR in series

Option C: CSTR followed by P.F. reactor

Option D: P.F. reactor followed by CSTR

Correct Answer: CSTR followed by P.F. reactor ✔

Option A: Reaction kinetics for single particle

Option B: Size distribution of solids being treated

Option C: Flow patterns of solids and fluid in the reactor

Option D: All A., B. and C.

Correct Answer: D. All A., B. and C. ✔

Option A: Activated complex theory

Option B: Collision theory

Option C: Thermodynamics

Option D: None of these

Correct Answer: Activated complex theory ✔

Option A: 0

Option B: ∞

Option C: < 0.5

Option D: > 0.5

Correct Answer: 0 ✔

Option A: Catalyst

Option B: Temperature

Option C: Reactants concentration

Option D: Number of molecules of reactants taking part in a reaction

Correct Answer: Number of molecules of reactants taking part in a reaction ✔

Option A: Equilibrium constant is 1

Option B: Conversion of the reactant at equilibrium condition is zero

Option C: Reactant concentration at equilibrium condition is zero

Option D: All A., B. and C.

Correct Answer: Reactant concentration at equilibrium condition is zero ✔

Option A: Size requirement

Option B: Distribution of reaction products

Option C: Both A. and B.

Option D: Neither A. nor B.

Correct Answer: C. Both A. and B. ✔

Option A: Retards the rate of reaction

Option B: Reduces the value of equilibrium constant

Option C: Does not initiate the reaction

Option D: All A., B. and C.

Correct Answer: Retards the rate of reaction ✔

Option A: 0.5

Option B: 1

Option C: 1.5

Option D: 2

Correct Answer: 1 ✔

Option A: Activation

Option B: Potential

Option C: Binding

Option D: Threshold

Correct Answer: Activation ✔

Option A: m

Option B: 1/m

Option C: √m

Option D: m2

Correct Answer: m ✔

Option A: Zero

Option B: One

Option C: Two

Option D: Three

Correct Answer: One ✔

Option A: k ∝ T1.5

Option B: k ∝ exp(-E/RT)

Option C: k ∝ √T

Option D: k ∝ T

Correct Answer: k ∝ √T ✔

Option A: Suitable for gas phase reactions

Option B: Ideal at very low conversion

Option C: Same as plug flow reactor (PFR)

Option D: Same as ideal stirred tank reactor

Correct Answer: Same as ideal stirred tank reactor ✔

Option A: Increase in the number of effective collisions

Option B: Decrease in activation energy

Option C: Increase in the average kinetic energy of the reacting molecules

Option D: None of these

Correct Answer: Decrease in activation energy ✔

Option A: Increase of temperature

Option B: Decrease of temperature

Option C: Increase in initial concentration of A

Option D: Decrease in initial concentration of A

Correct Answer: Increase of temperature ✔

Option A: Pore volume

Option B: Solid density

Option C: Porosity

Option D: All A., B., & C.

Correct Answer: All A., B., & C. ✔

Option A: Batch reactor

Option B: Tubular flow reactor

Option C: Stirred tank reactor

Option D: Fluidised bed reactor

Correct Answer: Tubular flow reactor ✔

Option A: The time required to reduce the concentration of the reacting substance to half its initial value

Option B: Half of the space time of a reaction

Option C: Half of the residence time of a reaction

Option D: None of these

Correct Answer: The time required to reduce the concentration of the reacting substance to half its initial value ✔

Option A: (atm)-1

Option B: (hr)-1

Option C: (atm)-1.(hr)-1

Option D: atm.(hr)-1

Correct Answer: (atm)-1 ✔

Option A: Is same as that in the reactor

Option B: Is different than that in the reactor

Option C: Depends upon the flow rate of inlet stream

Option D: None of these

Correct Answer: Is same as that in the reactor ✔

Option A: Mixed

Option B: Integral (plug flow)

Option C: Differential (flow)

Option D: Either A., B. and C.

Correct Answer: D. Either A., B. and C. ✔

Option A: Dynamic steady

Option B: Static steady

Option C: Dynamic unsteady

Option D: None of these

Correct Answer: Dynamic steady ✔

Option A: 7

Option B: 6

Option C: 3

Option D: 7/3

Correct Answer: 7 ✔

Option A: Whole surface of the catalyst does not have the same activity for adsorption and there is

Option B: Whole surface of the catalyst is essentially uniform and the adsorbed molecule has no effect

Option C: All the adsorption does not take place by the same mechanism

Option D: Extent of adsorption is more than one complete monomolecular layer on the surface

Correct Answer: B. Whole surface of the catalyst is essentially uniform and the adsorbed molecule has no effect
on the rate of adsorption per site ✔

Option A: Parallel

Option B: Series

Option C: Series-parallel

Option D: None of these

Correct Answer: Series ✔

Option A: I, II, III

Option B: III, II, I

Option C: III, I, II

Option D: II, III, I

Correct Answer: III, II, I ✔

Option A: Fixed bed reactor

Option B: Fluidised bed reactor

Option C: Semi-fluidised bed reactor

Option D: Plug-flow catalytic reactor

Correct Answer: Semi-fluidised bed reactor ✔

Option A: Activation energy

Option B: Normal energy of reactants

Option C: Sum of A. & B.

Option D: Neither A. nor B.

Correct Answer: C. Sum of A. & B. ✔

Option A: CA (K1 + K2)

Option B: CA (K1 + K2)/2

Option C: CA . K1/2

Option D: CA . K2/2

Correct Answer: CA (K1 + K2) ✔

Option A: Increases

Option B: Decreases

Option C: Remains unchanged

Option D: Unpredictable from the data

Correct Answer: Increases ✔

Option A: Both conversion as well as concentration are same

Option B: Conversion in both will be the same but concentrations will be different

Option C: Both the conversion as well as concentrations will be different

Option D: None of these

Correct Answer: Conversion in both will be the same but concentrations will be different ✔

Option A: Fluidised bed reactor

Option B: Moving bed reactor

Option C: Fixed bed reactor

Option D: None of these

Correct Answer: Moving bed reactor ✔

Option A: ∝ CA

Option B: ∝ 1/CA

Option C: Independent of temperature

Option D: None of these

Correct Answer: None of these ✔

Option A: Equilibrium constant

Option B: Volume of the reaction vessel

Option C: Nature of the reactants

Option D: Molar concentration of the reactants

Correct Answer: Molar concentration of the reactants ✔

Option A: Zeroth order

Option B: First order

Option C: Second order

Option D: Third order

Correct Answer: Third order ✔

Option A: Increases

Option B: Decreases

Option C: Remain unaffected

Option D: Unpredictable from the data

Correct Answer: Increases ✔

Option A: CSTR followed by a PFR

Option B: PFR followed by a CSTR

Option C: CSTR followed by a PFR followed by a CSTR

Option D: PFR followed by a CSTR followed by a PFR

Correct Answer: CSTR followed by a PFR ✔

Option A: 1

Option B: 2

Option C: 3

Option D: 4

Correct Answer: 2 ✔

Option A: rA = rB

Option B: rA = -rB

Option C: rA = 2rB

Option D: rA = rB/2

Correct Answer: rA = -rB ✔

Option A: ln (k2/k1) = (E/R) (1/T2 – 1/T1)

Option B: ln (k2/k1) = (E/R) (1/T1 – 1/T2)

Option C: exp (k2/k1) = (E/R) (1/T2 – 1/T1)

Option D: exp (k2/k1) = (E/R) (1/T1 – 1/T2)

Correct Answer: B. ln (k2/k1) = (E/R) (1/T1 – 1/T2) ✔

Option A: Greater than

Option B: Equal to

Option C: Smaller than

Option D: Unpredictable from the data

Correct Answer: Smaller than ✔

Option A: Low temperature in a CSTR

Option B: High temperature in a CSTR

Option C: Low temperature in a PFR

Option D: High temperature in a PFR

Correct Answer: High temperature in a PFR ✔

Option A: Active at cryogenic temperatures only

Option B: Prohibitively costly

Option C: Proteinous in nature

Option D: Active at very high temperature only

Correct Answer: Proteinous in nature ✔

Option A: 1

Option B: -0.5

Option C: -0.25

Option D: 0

Correct Answer: -0.25 ✔

Option A: Active mass

Option B: Equivalent weight

Option C: Molecular weight

Option D: None of these

Correct Answer: Active mass ✔

Option A: Time

Option B: Temperature

Option C: Concentration

Option D: All A., B. & C.

Correct Answer: D. All A., B. & C. ✔

Option A: Packed

Option B: Spray

Option C: Tray

Option D: Bubble

Correct Answer: Bubble ✔

Option A: Surface area

Option B: Porosity

Option C: Pore volume

Option D: Both B. & C.

Correct Answer: D. Both B. & C. ✔

Option A: Increase

Option B: Decrease

Option C: Remain same

Option D: Data in insufficient; can’t be predicted

Correct Answer: Increase ✔

Option A: Initial concentration of the reactants remains constant

Option B: Free energy of activation is lower

Option C: Entropy changes

Option D: Free energy of activation is higher

Correct Answer: Free energy of activation is higher ✔

Option A: XA = k . t

Option B: [CA0/(1 + εA XA)] (dXA/dt) = k

Option C: -ln(1 – XA) = kt

Option D: εA . ln (1 – XA) = k . t

Correct Answer: [CA0/(1 + εA XA)] (dXA/dt) = k ✔

Option A: Axial dispersion

Option B: Flat velocity profile

Option C: Uniform mixing

Option D: None of these

Correct Answer: Flat velocity profile ✔

Option A: 0

Option B: 1

Option C: 2

Option D: 3

Correct Answer: 0 ✔

Option A: K α √T.e-E/RT

Option B: K α eE/RT

Option C: K α e-E/RT

Option D: None of these

Correct Answer: K α e-E/RT ✔

Option A: Is independent of pressure

Option B: Increases with pressure

Option C: Decreases with pressure

Option D: Increases /decreases with pressure depending on the stoichiometric co-efficients of the

Correct Answer: Increases with pressure ✔

Option A: 0

Option B: 1

Option C: 2

Option D: 3

Correct Answer: 3 ✔

Option A: Highest possible

Option B: Lowest possible

Option C: Intermediate

Option D: Room

Correct Answer: Highest possible ✔

Option A: Five reactor volumes of feed (at specified conditions) are being fed into the reactor per hour

Option B: After every 5 hours, reactor is being filled with the feed

Option C: Cent per cent conversion can be achieved in at least 5 hours

Option D: A fixed conversion of a given batch of feed takes 5 hours

Correct Answer: Five reactor volumes of feed (at specified conditions) are being fed into the reactor per hour ✔

Option A: 400

Option B: 500

Option C: 600

Option D: 1000

Correct Answer: 600 ✔

Option A: Film diffusion

Option B: Diffusion through ash layer

Option C: Chemical reaction

Option D: Either A., B. or C.

Correct Answer: Chemical reaction ✔

Option A: 8

Option B: 12

Option C: 16

Option D: 32

Correct Answer: 16 ✔

Option A: Ash resistance

Option B: Gas film and pore surface diffusion resistances for reactants

Option C: Surface phenomenon resistance

Option D: Gas film and pore surface diffusion resistances for products

Correct Answer: Ash resistance ✔

Option A: Always irreversible

Option B: Insensitive to temperature changes

Option C: Mostly irreversible

Option D: Highly temperature sensitive

Correct Answer: Insensitive to temperature changes ✔

Option A: 4

Option B: 8

Option C: 12

Option D: 16

Correct Answer: 16 ✔

Option A: Uniformity of temperature

Option B: Comparatively smaller equipment

Option C: Very small pressure drop

Option D: Absence of continuous catalyst regeneration facility

Correct Answer: Uniformity of temperature ✔

Option A: Decreases with increase in temperature

Option B: Increases with increase of pressure of reactants for all reactions

Option C: Decreases with increase of reactant concentration

Option D: None of these

Correct Answer: None of these ✔

Option A: Converts N2 and H2 into NH3

Option B: Converts CO to CO2 with steam

Option C: Is non-catalytic

Option D: Is highly exothermic

Correct Answer: Converts CO to CO2 with steam ✔

Option A: 1/(1 + k2 . CA0 . t)

Option B: (k2 . CA0 . t)/ (1 + k2 . CA0 . t)

Option C: (k2 . CA0 . t)2/ (1 + k2 . CA0 . t)

Option D: (k2 . CA0 . t)/ (1 + k2 . CA0 . t)2

Correct Answer: (k2 . CA0 . t)/ (1 + k2 . CA0 . t) ✔

Option A: A + B ⇌ AB; AB + A → A2B

Option B: A + B → AB; AB + A → A2B

Option C: A + A → AA; AA + B → A2B

Option D: A + A ⇌ AA; AA + B → A2B

Correct Answer: A + A ⇌ AA; AA + B → A2B ✔

Option A: Velocity of reaction can be controlled

Option B: Maximum conversion can be controlled

Option C: Both the reactants flow counter-currently

Option D: Residence time is constant

Correct Answer: Velocity of reaction can be controlled ✔

Option A: 2-5 %

Option B: 7-10 %

Option C: 12-15 %

Option D: 20-25 %

Correct Answer: 7-10 % ✔

Option A: 0

Option B: 1

Option C: 0.1

Option D: 0.5

Correct Answer: 0 ✔

Option A: 8987°K

Option B: 9210°K

Option C: 8764°K

Option D: 8621°K

Correct Answer: 9210°K ✔

Option A: Specific inter-facial area

Option B: Liquid hold-up

Option C: Both A. and B.

Option D: None of these

Correct Answer: C. Both A. and B. ✔

Option A: Exothermic

Option B: Endothermic

Option C: Biochemical

Option D: Photochemical

Correct Answer: Exothermic ✔

Option A: Collision theory and activated complex theory

Option B: Chain reaction theory

Option C: Radiation hypothesis

Option D: None of these

Correct Answer: None of these ✔

Option A: 100%

Option B: 95%

Option C: 75%

Option D: 20%

Correct Answer: 95% ✔

Option A: Less when they are connected in series

Option B: More when they are connected in series

Option C: More when they are connected in parallel

Option D: Same whether they are connected in series or in parallel

Correct Answer: More when they are connected in series ✔

Option A: Space time for each parallel line is same

Option B: Space time for parallel lines is different

Option C: Larger reactors have more space time compared to smaller ones

Option D: None of these

Correct Answer: Space time for each parallel line is same ✔

Option A: 7/2

Option B: 7/4

Option C: 5/2

Option D: 5/4

Correct Answer: 7/2 ✔

Option A: Slower rate of reaction

Option B: Higher rate of reaction

Option C: Higher equilibrium conversion

Option D: Both B. and C.

Correct Answer: Slower rate of reaction ✔

Option A: Increases

Option B: Decreases

Option C: Remain same

Option D: May increase or decrease depending on the type of reaction

Correct Answer: Decreases ✔

Option A: When the data are scattered

Option B: For testing specific mechanisms with simple rate expressions

Option C: Both A. and B.

Option D: None of these

Correct Answer: C. Both A. and B. ✔

Option A: 2η

Option B: 0.5η

Option C: η/0.693

Option D: 0.693η

Correct Answer: 2η ✔

Option A: Unimolecular reaction with first order

Option B: Bimolecular reaction with second order

Option C: Bimolecular reaction with first order

Option D: Unimolecular reaction with second order

Correct Answer: Bimolecular reaction with first order ✔

Option A: Dehydration of ethanol

Option B: Methanol synthesis

Option C: Reformation of methane

Option D: Polymerisation of ethylene

Correct Answer: Dehydration of ethanol ✔

Option A: 0.03 sec-1

Option B: 0.03 min-1

Option C: 0.03 hr-1

Option D: 0.05 min-1

Correct Answer: 0.03 min-1 ✔

Option A: Elementary

Option B: Non-elementary

Option C: Parallel

Option D: Autokinetic

Correct Answer: Elementary ✔

Option A: Rate

Option B: Feasibility

Option C: Both A. & B.

Option D: Neither A. nor B.

Correct Answer: Rate ✔

Option A: Lose a proton

Option B: Gain a proton

Option C: Lose an electron

Option D: None of these

Correct Answer: Lose a proton ✔

Option A: Always spontaneous

Option B: Slow

Option C: Fast

Option D: Non-spontaneous

Correct Answer: Fast ✔

Option A: Temperature only

Option B: Pressure only

Option C: Composition only

Option D: All A., B. and C.

Correct Answer: D. All A., B. and C. ✔