Chemical Reaction MCQs

Option A: Fastest

Option B: Slowest

Option C: Intermediate

Option D: Data insufficient; can’t be predicted

Correct Answer: Slowest ✔

Option A: Gas film diffusion

Option B: Ash diffusion

Option C: Chemical reaction

Option D: None of these

Correct Answer: Chemical reaction ✔

Option A: (1 + x)

Option B: (1 – x)

Option C: (1 + x)2

Option D: (1 – x)2

Correct Answer: (1 + x) ✔

Option A: And decreases that of backward reaction

Option B: And backward reaction equally

Option C: Only

Option D: To a greater extent than that of the backward reaction

Correct Answer: And backward reaction equally ✔

Option A: Concentration of the reactant

Option B: Temperature

Option C: Concentration of the product

Option D: Time

Correct Answer: Temperature ✔

Option A: Are the same as those of the rate constant

Option B: Depend on the order of the reaction

Option C: Depend on temperature, pressure etc. of the reaction

Option D: Are cycles per unit time

Correct Answer: Are the same as those of the rate constant ✔

Option A: 0

Option B: 1

Option C: 2

Option D: 3

Correct Answer: 1 ✔

Option A: Increases

Option B: Decreases

Option C: Either A. or B.; depends on the type of catalyst

Option D: Neither A. nor B.

Correct Answer: C. Either A. or B.; depends on the type of catalyst ✔

Option A: ∞

Option B: 0

Option C: 1

Option D: > 1

Correct Answer: 1 ✔

Option A: Activation

Option B: Potential

Option C: Kinetic

Option D: None of these

Correct Answer: Activation ✔

Option A: Catalytic

Option B: Parallel

Option C: Series

Option D: Auto catalytic

Correct Answer: Auto catalytic ✔

Option A: Autocatalytic

Option B: Irreversible

Option C: Reversible endothermic

Option D: Reversible exothermic

Correct Answer: Reversible endothermic ✔

Option A: A catalyst is added

Option B: The temperature is increased

Option C: An inert gas is pumped keeping the temperature constant

Option D: None of these

Correct Answer: The temperature is increased ✔

Option A: Inerts

Option B: Pressure

Option C: Temperature

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

Correct Answer: Temperature ✔

Option A: Order

Option B: Overall order

Option C: Molecularity

Option D: None of these

Correct Answer: Overall order ✔

Option A: Active mass

Option B: Molecular weight

Option C: Equivalent weight

Option D: Atomic weight

Correct Answer: Active mass ✔

Option A: Batch reactor

Option B: Back-mix reactor

Option C: Plug-flow reactor

Option D: Fixed bed reactor

Correct Answer: Back-mix reactor ✔

Option A: Is always equal to

Option B: Is always greater than

Option C: Is always less than

Option D: May be greater or less than

Correct Answer: Is always greater than ✔

Option A: More than

Option B: Less than

Option C: Equal to

Option D: Either B. or C.

Correct Answer: Equal to ✔

Option A: Changes on changing the concentration units

Option B: Is not a function of the unit of time

Option C: Has unit of time-1

Option D: None of these

Correct Answer: Has unit of time-1 ✔

Option A: Twice

Option B: Half

Option C: Equal

Option D: None of these

Correct Answer: Half ✔

Option A: Removal of one of the products regularly

Option B: Increase in the concentration of one of the products

Option C: Increase in the concentration of one of the reactants

Option D: None of these

Correct Answer: Increase in the concentration of one of the products ✔

Option A: Constant

Option B: Conversion

Option C: Both A. & B.

Option D: Neither A. nor B.

Correct Answer: Conversion ✔

Option A: Litre/mole.second

Option B: Moles/litre.second

Option C: Litre/mole

Option D: Litre/second

Correct Answer: Litre/mole.second ✔

Option A: Photochemical reactions

Option B: Microbial fermentation reaction

Option C: Enzyme fermentation reaction

Option D: Ammonia synthesis reaction

Correct Answer: Microbial fermentation reaction ✔

Option A: Increase

Option B: Increase exponentially

Option C: Decrease

Option D: Remain unchanged

Correct Answer: Decrease ✔

Option A: Temperature is increased

Option B: Pressure is reduced

Option C: Temperature is increased and pressure is reduced

Option D: Temperature is reduced and pressure is increased

Correct Answer: Temperature is reduced and pressure is increased ✔

Option A: k cal

Option B: k cal/°K

Option C: °K

Option D: k cal. °K

Correct Answer: °K ✔

Option A: Use high pressure and eliminate inerts, when a > b

Option B: Avoid recycle, when a > b

Option C: Use batch reactor or plug flow reactor, when a > b

Option D: Use CSTR with a high conversion, when a > b

Correct Answer: Avoid recycle, when a > b ✔

Option A: Only chemical

Option B: Only physical

Option C: Both A. & B.

Option D: Neither A. nor B.

Correct Answer: C. Both A. & B. ✔

Option A: Double

Option B: Triple

Option C: Equal to

Option D: None of these

Correct Answer: Equal to ✔

Option A: Of very large activation energy of many bodies

Option B: Of low probability of many body collisions

Option C: Many body collisions are not favoured energetically

Option D: Of requirement of very large concentration for such reactions

Correct Answer: Of low probability of many body collisions ✔

Option A: Equilibrium constant

Option B: Activation energy

Option C: Final products

Option D: Heat of reaction

Correct Answer: Activation energy ✔

Option A: Lack of intraparticle diffusion resistance

Option B: Presence of two mobile phases

Option C: Both A. and B.

Option D: Neither A. nor B.

Correct Answer: C. Both A. and B. ✔

Option A: Maxima in the concentration of A

Option B: Maxima in the concentration of B

Option C: Maxima in the concentration of C

Option D: High exothermicity

Correct Answer: Maxima in the concentration of B ✔

Option A: Consecutive or side

Option B: Parallel or side

Option C: Mixed

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

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

Option A: Is always equal to the overall order of reaction

Option B: May not be equal to the order of reaction

Option C: Can’t have a fractional value

Option D: Both B. and C.

Correct Answer: D. Both B. and C. ✔

Option A: Conservation of mass

Option B: Avogadro’s hypothesis

Option C: Gaseous volumes

Option D: None of these

Correct Answer: Conservation of mass ✔

Option A: Blood

Option B: Saliva

Option C: Intestine

Option D: Gland

Correct Answer: Saliva ✔

Option A: 2HI ⇌ H2 + I2

Option B: N2O2 ⇌ 2NO2

Option C: N2 + O2 ⇌ 2NO

Option D: None of these

Correct Answer: N2O2 ⇌ 2NO2 ✔

Option A: 0.80

Option B: 1.33

Option C: 1.60

Option D: 2.67

Correct Answer: 1.60 ✔

Option A: In a multistep reaction, the slowest step is the rate determining step

Option B: In general, the rate of a reaction becomes triple for every 10°C rise in temperature

Option C: Slow chemical reactions have generally high values of activation energy

Option D: Molecularity of a reaction cannot be zero but the order of a reaction can be zero

Correct Answer: In general, the rate of a reaction becomes triple for every 10°C rise in temperature ✔

Option A: A P.F. reactor in series

Option B: A P.F. reactor in parallel

Option C: More CSTR’s in series

Option D: More CSTR’s in parallel

Correct Answer: C. More CSTR’s in series ✔

Option A: k ∝ √T

Option B: k ∝ e-E/RT

Option C: k ∝ T e-E/RT

Option D: None of these

Correct Answer: k ∝ e-E/RT ✔

Option A: nD = (n + 1)/2

Option B: nD = n/2

Option C: nD = n + 1

Option D: None of these

Correct Answer: nD = (n + 1)/2 ✔

Option A: Temperature of the system

Option B: Presence or absence of inerts

Option C: Pressure of the system

Option D: Kinetics of the reaction

Correct Answer: Pressure of the system ✔

Option A: (i) increases (ii) decreases

Option B: (i) decreases (ii) increases

Option C: (i) increases (ii) increases

Option D: (i) decreases (ii) decreases

Correct Answer: (i) decreases (ii) increases ✔

Option A: CA0 Vs t1/2

Option B: ln CA0 Vs t1/2

Option C: CA0 Vs ln t1/2

Option D: ln CA0 Vs ln t1/2

Correct Answer: CA0 Vs ln t1/2 ✔

Option A: A

Option B: N

Option C: A + N

Option D: A – N

Correct Answer: A ✔

Option A: Has altogether three streams either entering or leaving

Option B: Processes three reactants at different flow rates

Option C: Processes three reactants with same flow rate

Option D: Employs all the three phases (i.e. solid, liquid and gas)

Correct Answer: Employs all the three phases (i.e. solid, liquid and gas) ✔

Option A: Autocatalytic

Option B: Photochemical

Option C: Consecutive

Option D: Zero order

Correct Answer: Photochemical ✔

Option A: An ordinary non-linear differential equation

Option B: An algebraic differential equation

Option C: A linear partial differential equation

Option D: A non-linear partial differential equation

Correct Answer: A linear partial differential equation ✔

Option A: A CSTR

Option B: CSTR in series

Option C: A plug flow reactor followed by CSTR

Option D: CSTR followed by a plug flow reactor

Correct Answer: CSTR followed by a plug flow reactor ✔

Option A: Reaction is elementary with a molecularity of 2

Option B: Molecularity of the reaction is 2, but the reaction may not be elementary

Option C: Reaction may be elementary with molecularity of 2

Option D: Reaction is elementary but the molecularity may not be 2

Correct Answer: Reaction is elementary with a molecularity of 2 ✔

Option A: A well stirred batch reactor

Option B: A plug-flow reactor

Option C: A single CSTR

Option D: CSTR’s connected in series

Correct Answer: A single CSTR ✔

Option A: 1/4

Option B: 2

Option C: 4

Option D: 16

Correct Answer: 4 ✔

Option A: Maximum at the inlet of the reactor

Option B: Maximum at the exit of the reactor

Option C: Maximum at the centre of the reactor

Option D: Constant throughout the reactor

Correct Answer: Maximum at the inlet of the reactor ✔

Option A: At high P and high T

Option B: At low P and high T

Option C: At low P and low T

Option D: At high P and low T

Correct Answer: At low P and low T ✔

Option A: Thermal

Option B: Activation

Option C: Threshold

Option D: Binding

Correct Answer: Activation ✔

Option A: Zero

Option B: First

Option C: Second

Option D: None of these

Correct Answer: Second ✔

Option A: Is maximum at the inlet of the reactor

Option B: Goes through a maximum along the length of the reactor

Option C: Goes through a minimum along the length of the reactor

Option D: Is maximum at the exit of the reactor

Correct Answer: Is maximum at the inlet of the reactor ✔

Option A: Decay reactions

Option B: Pore diffusion

Option C: Form of surface attack by poison

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

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

Option A: Deposited

Option B: Chemisorbed

Option C: Selectivity

Option D: Stability

Correct Answer: Deposited ✔

Option A: 0

Option B: 1

Option C: 10

Option D: ∞

Correct Answer: 0 ✔

Option A: Only

Option B: To a greater extent than that of the backward reaction

Option C: And decreases that of the backward reaction

Option D: And the backward reaction equally

Correct Answer: And the backward reaction equally ✔

Option A: Space time is equivalent to holding time for constant density systems

Option B: Composition throughout the reactor remains same

Option C: Exit stream has the same composition as the fluid within the reactor

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

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

Option A: Large catalyst particle size

Option B: An active surface of the catalyst

Option C: Small pore diameter

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

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

Option A: 1

Option B: 3

Option C: 1/3

Option D: 32

Correct Answer: 3 ✔

Option A: Increases

Option B: Decreases

Option C: Remain constant

Option D: Unpredictable

Correct Answer: Remain constant ✔

Option A: 2 & 1

Option B: 11 & 2

Option C: 2 & 2

Option D: 1 & 1

Correct Answer: 2 & 1 ✔

Option A: Pore diffusion

Option B: Film diffusion

Option C: Ash layer diffusion

Option D: Chemical reaction

Correct Answer: Film diffusion ✔

Option A: K α e-E/RT

Option B: K α eE/RT

Option C: K α T . e-E/RT

Option D: K α √T . e-E/RT

Correct Answer: K α e-E/RT ✔

Option A: Fast reactions in catalyst of small pore diameter

Option B: Fast reaction in catalyst of large pore diameter

Option C: Slow reactions in catalyst of small pore diameter

Option D: Slow reactions in catalyst of large pore diameter

Correct Answer: Slow reactions in catalyst of small pore diameter ✔

Option A: Directly proportional to

Option B: Inversely proportional to

Option C: Independent of

Option D: None of these

Correct Answer: Independent of ✔

Option A: Decrease

Option B: Increase

Option C: No change

Option D: Either A. or B., depends on the type of reaction

Correct Answer: No change ✔

Option A: Semi-batch

Option B: Tubular

Option C: Batch

Option D: Back-mix

Correct Answer: Back-mix ✔

Option A: Activation energy

Option B: Equilibrium constant

Option C: Heat of reaction

Option D: None of these

Correct Answer: Activation energy ✔

Option A: Elementary

Option B: Parallel

Option C: Consecutive

Option D: None of these

Correct Answer: Consecutive ✔

Option A: 1

Option B: 0

Option C: ∞

Option D: Between 0 and 1

Correct Answer: 0 ✔

Option A: N2 + O2 ⇌ 2NO

Option B: PCl3 + Cl2 ⇌ PCl5

Option C: N + 3H2 ⇌ 2NH3

Option D: 2SO2 + O2 ⇌ 2SO3

Correct Answer: N2 + O2 ⇌ 2NO ✔

Option A: Open

Option B: Closed

Option C: Open-closed

Option D: Close-opened

Correct Answer: Closed ✔

Option A: The intrinsic activation energy E

Option B: (E + ED) where ED is activation due to diffusion

Option C: (E + ED)/2

Option D: ED/2

Correct Answer: ED/2 ✔

Option A: Continuously increases

Option B: Continuously decreases

Option C: Passes through a maximum

Option D: Passes through a minimum

Correct Answer: Passes through a maximum ✔

Option A: Very temperature sensitive

Option B: Temperature insensitive

Option C: Always irreversible

Option D: Always reversible

Correct Answer: Very temperature sensitive ✔

Option A: 0.5

Option B: 1

Option C: 2

Option D: 3

Correct Answer: 0.5 ✔

Option A: Increases the equilibrium concentration of the product

Option B: Changes the equilibrium constant of the reaction

Option C: Shortens the time to reach the equilibrium

Option D: None of these

Correct Answer: Shortens the time to reach the equilibrium ✔

Option A: (FA0/V) – (dCA/dt)

Option B: (FA0/V) + (dCA/dt)

Option C: (FA0/V) XA

Option D: -(dCA/dt)

Correct Answer: (FA0/V) XA ✔

Option A: Increases

Option B: Decreases

Option C: Remain same

Option D: Increases linearly

Correct Answer: Increases ✔

Option A: Absorption of A

Option B: Surface reaction between absorbed A and absorbed B

Option C: Surface reaction between absorbed A and B in the gas phase

Option D: Surface reaction between A in the gas phase and absorbed B

Correct Answer: Surface reaction between absorbed A and B in the gas phase ✔

Option A: Zero order & K1/K2

Option B: Zero order & K1

Option C: First order & K1

Option D: First order & K1/K2

Correct Answer: Zero order & K1/K2 ✔

Option A: 0

Option B: ∞

Option C: 1

Option D: -1

Correct Answer: 0 ✔

Option A: K α e-E/RT

Option B: K α eE/RT

Option C: K α T . e-E/RT

Option D: K α √T . e-E/RT

Correct Answer: K α T . e-E/RT ✔

Option A: Reversible exothermic

Option B: Irreversible exothermic

Option C: Irreversible endothermic

Option D: Reversible endothermic

Correct Answer: Reversible endothermic ✔

Option A: A ferment or an enzyme

Option B: Haemoglobin

Option C: Fungi

Option D: None of these

Correct Answer: Fungi ✔

Option A: exp (-E/RT)

Option B: exp (-E/2RT)

Option C: √T

Option D: Tm exp (-E/RT)

Correct Answer: exp (-E/RT) ✔

Option A: Same as that of rate constant

Option B: Same as that of activation energy

Option C: Dimensionless

Option D: None of these

Correct Answer: Same as that of rate constant ✔

Option A: Operational yield

Option B: Relative yield

Option C: Selectivity

Option D: None of these

Correct Answer: Selectivity ✔

Option A: When the density of the reaction mixture is constant

Option B: For large diameter tubular reactor

Option C: For narrow diameter tubular reactor

Option D: For CSTR

Correct Answer: When the density of the reaction mixture is constant ✔

Option A: Composition of the component only

Option B: Temperature of the system

Option C: Pressure of the system

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

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

Option A: Decreases

Option B: Increases

Option C: Remains unaltered

Option D: Changes unpredictably

Correct Answer: Decreases ✔