Pick the WRONG design guideline for a reactor in which the reactions, A → R (desired) and A → S (undesired) are to take place. The ratio of the reaction rates is as given below .

use batch reactor or plug flow reactor, when a > b.

use high pressure and eliminate inerts, when a > b.

use batch reactor or plug flow reactor, when a > b.

use CSTR with a high conversion, when a > b.

A consecutive reaction given below, is characterised by

maxima in the concentration of C.

maxima in the concentration of A.

maxima in the concentration of B.

maxima in the concentration of C.

The rate of a following autocatalytic reaction, is given by -rᴀ = k . Cᴀ . Cʙ. In this case, the

plot of - rᴀ Vs Cᴀ is a straight line with slope k.

plot of - rᴀ Vs Cᴀ is a hyperbola.

rate of disappearance of reactant A is maximum, where Cᴀ = Cʙ

In a consecutive reaction system given below, when E₁ is much greater than E₂, the yield of B increases with the

increase in initial concentration of A.

decrease in initial concentration of A.

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

Single CSTR is the most suitable

Batch reactor is preferred over a single CSTR for high yield

Tubular reactor is preferred over a single CSTR for high yield

Single CSTR is the most suitable

Find a mechanism that is consistent with the rate equation and reaction given below: 2A + B → A₂B, ( - rA) = k.CA.CB

A + B ⇋ AB ; AB + A → A₂B

During manufacture of H₂SO₄, the oxidation of SO₂ to SO₃ by oxygen is an en- dothermic reaction. The yield of SO₃ will be maximised, if the

Temperature is increased and pressure is reduced

Temperature is reduced and pressure is increased

"A spherical porous catalyst particle of radius R is subjected to reactant A which reacts to form B by a zero order surface reaction A → B. Film mass transfer resistance is negligible and pore diffusion of A is rate controlling. The effectiveness factor of the catalyst is reported as 7/8. Which of the following statement is true?A. Inner catalyst core of radius R/8 does not participate in reaction."

Inner catalyst core of radius R/2 does not participate in reaction

Inner catalyst core of radius R/8 does not participate in reaction

Inner catalyst core of radius R/2 does not participate in reaction

Inner catalyst core of radius 7R/8 does not participate in reaction

Ffectiveness factor for a zero order reaction can not be 7/8 as it must always be 1

The reaction rate almost gets doubled for 10°C rise in temperature. This is due to the fact that the

Increased temperature reduces the activation energy

Fraction of molecules having threshold energy increases

Value of threshold energy decreases

The rate of the heterogenous catalytic reaction A(g) + B(g) ? C(g) is given by -rA = k.KA.pA.PB/(1 + KA.PA + Kc.pc), where KA and Kc are the adsorption equilibrium constants. The rate controlling step for this reaction isA. absorption of A.

Surface reaction between A in the gas phase and absorbed B

Surface reaction between absorbed A and absorbed B

Surface reaction between absorbed A and B in the gas phase

Surface reaction between A in the gas phase and absorbed B

If the pore diffusion controls in a catalytic reaction, the apparent activation energy Ea is equal to

The intrinsic activation energy E

(E + ED) where ED is activation due to diffusion

The irreversible reaction, X → Y, is the special case of the reversible reaction, X ⇋ Y, in which the

Equilibrium constant is infinite

1443 + Mcqs in Chemical Reaction Engineering in Chemical Engineering Page 6 McqOptions

251.	What is the Thiele modulus of the solid catalysed first order reaction given below, if the pore diffusion offers negligible resistance to reaction ?
A.	< 5
B.	< 0.5
C.	> 1
D.	5
Answer» C. > 1

Discussion

252.	For a series of reactions given below, having k1 << k2, the reaction system can be approximated as
A.	A
B.	B
C.	C
D.	D
Answer» E.

Discussion

253.	Pick the WRONG design guideline for a reactor in which the reactions, A → R (desired) and A → S (undesired) are to take place. The ratio of the reaction rates is as given below .
A.	use high pressure and eliminate inerts, when a > b.
B.	avoid recycle, when a > b.
C.	use batch reactor or plug flow reactor, when a > b.
D.	use CSTR with a high conversion, when a > b.
Answer» C. use batch reactor or plug flow reactor, when a > b.

Discussion

254.	In case of a consecutive unimolecular type first order reaction given below, the concentration of component __________ increases continuously with time.
A.	S
B.	R
C.	A
D.	none of these
Answer» B. R

Discussion

255.	The equilibrium constant for the reversible reaction given below, is affected by the
A.	temperature of the system.
B.	presence or absence of inerts.
C.	pressure of the system.
D.	kinetics of the reaction.
Answer» D. kinetics of the reaction.

Discussion

256.	For the irreversible elementary first order reaction in parallel given below, a plot of Cy Vs. Cz will give a straight line having a slope of
A.	K₂/K₁
B.	K₁/K₂
C.	K₁.K₂
D.	K₁ + K₂
Answer» C. K₁.K₂

Discussion

257.	A consecutive reaction given below, is characterised by
A.	maxima in the concentration of A.
B.	maxima in the concentration of B.
C.	maxima in the concentration of C.
D.	high exothermicity.
Answer» C. maxima in the concentration of C.

Discussion

258.	A first order reaction A → B occurs in an isothermal porous catalyst pellet of spherical shape. If the concentration of A at the centre of the pellet is much less than at the external surface, the process is limited by
A.	diffusion within the pellet.
B.	reaction.
C.	external mass transfer.
D.	none of the above.
Answer» B. reaction.

Discussion

259.	A first order homogeneous reaction of the type X → Y → Z (consecutive reaction) is carried out in a CSTR. Which of the following curves respectively show the variation of the concentration of X, Y and Z with time?
A.	I, II, III
B.	III, II, I
C.	III, I, II
D.	II, III, I
Answer» C. III, I, II

Discussion

260.	In a chemical reaction given below , it is observed that the (i) rate of formation of 'P' is doubled on doubling the concentration of 'X'. (ii) rate of formation of 'P' is quadrupled on doubling the concentration of 'Y'. (iii) doubling the concentration of 'Z' does not affect the rate of formation of 'P'. What is the order of the above chemical reaction?
A.	Zeroth order
B.	First order
C.	Second order
D.	Third order
Answer» E.

Discussion

261.	Second order consecutive irreversible reactions given below were carried out in a constant volume isothermal batch reactor with different initial feed compositions. Reactor temperature was same in all the cases. In experiments where the ratio of concentration of B to that of A in the initial feed was less than 0.5, the concentration of B increased first, reached a maximum and then declined with time. However, for all experiments where this concentration ratio was 0.5 or above, concentration of B decreased monotonically with time right from the beginning. What is the ratio of the two rate constants (k₁/k₂)?
A.	1/4
B.	1/2
C.	2
D.	4
Answer» B. 1/2

Discussion

262.	For the reaction given below, 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.	0.1
C.	0.2
D.	none of these
Answer» B. 0.1

Discussion

263.	The rate of a following autocatalytic reaction, is given by -rᴀ = k . Cᴀ . Cʙ. In this case, the
A.	plot of - rᴀ Vs Cᴀ is a straight line with slope k.
B.	plot of - rᴀ Vs Cᴀ is a hyperbola.
C.	rate of disappearance of reactant A is maximum, where Cᴀ = Cʙ
D.	both 'b' & 'c'
Answer» E.

Discussion

264.	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.	A
B.	B
C.	C
D.	D
Answer» E.

Discussion

265.	The first order gas phase reaction given below, is conducted isothermally in batch mode. The rate of change of conversion with time is given by
A.	A
B.	B
C.	C
D.	D
Answer» D. D

Discussion

266.	The point selectivity of the product 'Y' in the below reaction, is equal to
A.	K₁/K₂
B.	K₂/K₁
C.	K₁ - K₂
D.	K₂ - K₁
Answer» B. K₂/K₁

Discussion

267.	An elementary liquid phase decomposition reaction given below is to be carried out in a CSTR. The design equation is
A.	A
B.	B
C.	C
D.	D
Answer» B. B

Discussion

268.	When the reaction is dominated by in-traparticle diffusion, the apparent order of reaction (nᴅ) as measured is related to the true order (n) as
A.	A
B.	B
C.	C
D.	D
Answer» B. B

Discussion

269.	The half life period 't' of a zero order reaction given below, is equal to
A.	Cᴀ₀/2K
B.	Cᴀ₀/K
C.	0.693/K
D.	1/K
Answer» B. Cᴀ₀/K

Discussion

270.	The order of the following reaction is
A.	0
B.	1
C.	2
D.	3
Answer» B. 1

Discussion

271.	The rate expression for the gaseous phase reaction, CO + 2H₂ ↔ CH₃OH, is given below. Which of the following is not possible ?
A.	α = 1, β = 1, γ =1
B.	α = 1, β = 2, γ = 1
C.	α = 1/3, β = 2/3, γ = 1/3
D.	α = 1/2, β = 1, γ = 1/2
Answer» B. α = 1, β = 2, γ = 1

Discussion

272.	For a __________ order chemical reaction given below, the half life period is independent of the initial concentration of the reactant A.
A.	zero
B.	first
C.	second
D.	third
Answer» C. second

Discussion

273.	The rate equation for the reaction represented by below equation, is given by - rₓ = K₁ . Cₓ/(1 + K₂ Cₓ). At high value of Cₓ (i.e.., K₂Cₓ > > 1), the order of the reaction and the rate constant are respectively
A.	zero order & K₁/K₂
B.	zero order & K₁
C.	first order & K₁
D.	first order & K₁/K₂
Answer» B. zero order & K₁

Discussion

274.	Decomposition rate of a liquid 'X' which decomposes as per the following reaction is given by
A.	K₁ . Cₓ
B.	(K₁ + K₂ + K₃)Cₓ
C.	(K₁ + K₂)Cₓ
D.	(K₂ + K₃)Cₓ
Answer» D. (K₂ + K₃)Cₓ

Discussion

275.	Volume change for unimolecular type first order reaction given below, increases __________ with time.
A.	linearly
B.	exponentially
C.	parabolically
D.	logarithmically
Answer» C. parabolically

Discussion

276.	What is the order of the following chemical reaction, 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.	7/4
C.	5/2
D.	5/4
Answer» B. 7/4

Discussion

277.	In a consecutive reaction system given below, when E₁ is much greater than E₂, the yield of B increases with the
A.	increase of temperature.
B.	decrease of temperature.
C.	increase in initial concentration of A.
D.	decrease in initial concentration of A.
Answer» B. decrease of temperature.

Discussion

278.	For the irreversible elementary reactions in parallel like given below, the rate of disappearance of 'X' is equal to
A.	Cᴀ(K₁+K₂)
B.	Cᴀ(K₁+K₂)/2
C.	Cᴀ.K₁/2
D.	Cᴀ.K₂/2
Answer» B. Cᴀ(K₁+K₂)/2

Discussion

279.	For a reaction of the following type, the rate of reaction (- rₓ) is given by
A.	(K₁+K₁)Cₓ
B.	(K₁+K₂+K₃)Cₓ
C.	K₁Cᵥ - K₂Cₓ
D.	(K₁-K₂)Cₓ
Answer» D. (K₁-K₂)Cₓ

Discussion

280.	What is the value of 'n' if the reaction rate of the chemical reaction A → B, is proportional to CAn and it is found that the reaction rate triples, when the concentration of 'A' is increased 9 times ?
A.	1/2
B.	1/3
C.	1/9
D.	3
Answer» B. 1/3

Discussion

281.	The rate of the reaction, X → Y, quadruples when the concentration of 'X' is doubled. The rate expression for the reaction is, r = K Cxn, the value of 'n' in this case will be
A.	0
B.	1
C.	2
D.	3
Answer» D. 3

Discussion

282.	The rate of the chemical reaction A → B doubles as the concentration of A i.e.., CA is doubled. If rate of reaction is proportional to CAn, then what is the value of n for this reaction?
A.	0.5
B.	1
C.	0
D.	2
Answer» C. 0

Discussion

283.	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.	2/3
B.	5/8
C.	1/3
D.	3/8
Answer» C. 1/3

Discussion

284.	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
A.	Batch reactor is preferred over a single CSTR for high yield
B.	Tubular reactor is preferred over a single CSTR for high yield
C.	Both A and B
D.	Single CSTR is the most suitable
Answer» D. Single CSTR is the most suitable

Discussion

285.	To maximise the formation of R in the simultaneous reactionA + B → R , rR = 2CA0.5.CB2A + B → S , rS = 1.5 CA . CBWe should have
A.	Low CA, low CB
B.	Low CA, high CB
C.	High CA, low CB
D.	High CA, high CB
Answer» C. High CA, low CB

Discussion

286.	At a given temperature, K₁, K₂ and K3 are equilibrium constants for the following reactions 1, 2, 3 respectively.CH₄(g) + H₂O(g) ⇋ CO(g) + 3H₂(g),CO(g) + H₂O(g) ⇋ CO₂(g) + H₂(g)CH₄(g) + 2H₂O(g) ⇋ CO₂(g) + 4H₂(g)Then K₁, K₂ and K3 are related as:
A.	K3 = K₁.K₂
B.	K3 = (K₁.K₂)0.5
C.	K3(K₁+K₂)/2
D.	K3 = (K₁.K₂)2
Answer» B. K3 = (K₁.K₂)0.5

Discussion

287.	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
Answer» E.

Discussion

288.	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.	8987°K
B.	9210°K
C.	8764°K
D.	8621°K
Answer» C. 8764°K

Discussion

289.	During manufacture of H₂SO₄, the oxidation of SO₂ to SO₃ by oxygen is an en- dothermic reaction. The yield of SO₃ will be maximised, if the
A.	Temperature is increased
B.	Pressure is reduced
C.	Temperature is increased and pressure is reduced
D.	Temperature is reduced and pressure is increased
Answer» E.

Discussion

290.	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.	L√(K/D1)
B.	1/(L√(K/D1))
C.	1
D.	∞
Answer» C. 1

Discussion

291.	The following gas phase reactions are carried out isothermally in a CSTR.A → 2R ; r₁ = K₁pA ;K₁ = 20mole/(sec.m³ bar)A → 3S ; r₂ = K₂ pA ;K₂ = 40mole/ (sec.m³ .bar)What is the maximum possible value of FR(mole/sec.) ?
A.	1/3
B.	1/2
C.	2/3
D.	2
Answer» D. 2

Discussion

292.	"A spherical porous catalyst particle of radius R is subjected to reactant A which reacts to form B by a zero order surface reaction A → B. Film mass transfer resistance is negligible and pore diffusion of A is rate controlling. The effectiveness factor of the catalyst is reported as 7/8. Which of the following statement is true?A. Inner catalyst core of radius R/8 does not participate in reaction."
A.	Inner catalyst core of radius R/8 does not participate in reaction
B.	Inner catalyst core of radius R/2 does not participate in reaction
C.	Inner catalyst core of radius 7R/8 does not participate in reaction
D.	Ffectiveness factor for a zero order reaction can not be 7/8 as it must always be 1
Answer» B. Inner catalyst core of radius R/2 does not participate in reaction

Discussion

293.	The reaction rate almost gets doubled for 10°C rise in temperature. This is due to the fact that the
A.	Increased temperature reduces the activation energy
B.	Fraction of molecules having threshold energy increases
C.	Collision frequency increases
D.	Value of threshold energy decreases
Answer» C. Collision frequency increases

Discussion

294.	The rate of the heterogenous catalytic reaction A(g) + B(g) ? C(g) is given by -rA = k.KA.pA.PB/(1 + KA.PA + Kc.pc), where KA and Kc are the adsorption equilibrium constants. The rate controlling step for this reaction isA. absorption of A.
A.	Absorption of A
B.	Surface reaction between absorbed A and absorbed B
C.	Surface reaction between absorbed A and B in the gas phase
D.	Surface reaction between A in the gas phase and absorbed B
Answer» D. Surface reaction between A in the gas phase and absorbed B

Discussion

295.	If the pore diffusion controls in a catalytic reaction, the apparent activation energy Ea is equal to
A.	The intrinsic activation energy E
B.	(E + ED) where ED is activation due to diffusion
C.	(E + ED)/2
D.	ED/2
Answer» E.

Discussion

296.	The irreversible reaction, X → Y, is the special case of the reversible reaction, X ⇋ Y, in which the
A.	Equilibrium constant is infinite
B.	Fractional conversion of
C.	Concentration of
D.	All of the above
Answer» E.

Discussion

297.	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.	5, 10, 15
C.	10, 5, 15
D.	10, 15, 5
Answer» B. 5, 10, 15

Discussion

298.	The rate of a chemical reaction is almost doubled for every 10°C rise in temperature. The rate will increase __________ times, if the temperature rises form 10 to 100°C.
A.	256
B.	512
C.	112
D.	612
Answer» C. 112

Discussion

299.	Which of the following does not produce a change in the value of rate constant of a reaction?
A.	Pressure
B.	Temperature
C.	Concentration and catalyst
D.	None of these
Answer» D. None of these

Discussion

300.	In case of calcination of limestone, CaCO₃ CaO + CO₂, the addition of more of CaO will result in __________ in the concentration of CO₂.
A.	No change
B.	Increase
C.	Decrease
D.	Unpredictable from the data
Answer» B. Increase

Discussion

Explore topic-wise MCQs in Chemical Engineering.

What is the Thiele modulus of the solid catalysed first order reaction given below, if the pore diffusion offers negligible resistance to reaction ?

For a series of reactions given below, having k1 << k2, the reaction system can be approximated as

Pick the WRONG design guideline for a reactor in which the reactions, A → R (desired) and A → S (undesired) are to take place. The ratio of the reaction rates is as given below .

In case of a consecutive unimolecular type first order reaction given below, the concentration of component __________ increases continuously with time.

The equilibrium constant for the reversible reaction given below, is affected by the

For the irreversible elementary first order reaction in parallel given below, a plot of Cy Vs. Cz will give a straight line having a slope of

A consecutive reaction given below, is characterised by

A first order reaction A → B occurs in an isothermal porous catalyst pellet of spherical shape. If the concentration of A at the centre of the pellet is much less than at the external surface, the process is limited by

A first order homogeneous reaction of the type X → Y → Z (consecutive reaction) is carried out in a CSTR. Which of the following curves respectively show the variation of the concentration of X, Y and Z with time?

For the reaction given below, 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 ?

The rate of a following autocatalytic reaction, is given by -rᴀ = k . Cᴀ . Cʙ. In this case, the

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.)

The first order gas phase reaction given below, is conducted isothermally in batch mode. The rate of change of conversion with time is given by

The point selectivity of the product 'Y' in the below reaction, is equal to

An elementary liquid phase decomposition reaction given below is to be carried out in a CSTR. The design equation is

When the reaction is dominated by in-traparticle diffusion, the apparent order of reaction (nᴅ) as measured is related to the true order (n) as

The half life period 't' of a zero order reaction given below, is equal to

The order of the following reaction is

The rate expression for the gaseous phase reaction, CO + 2H₂ ↔ CH₃OH, is given below. Which of the following is not possible ?

For a __________ order chemical reaction given below, the half life period is independent of the initial concentration of the reactant A.

The rate equation for the reaction represented by below equation, is given by - rₓ = K₁ . Cₓ/(1 + K₂ Cₓ). At high value of Cₓ (i.e.., K₂Cₓ > > 1), the order of the reaction and the rate constant are respectively

Decomposition rate of a liquid 'X' which decomposes as per the following reaction is given by

Volume change for unimolecular type first order reaction given below, increases __________ with time.

What is the order of the following chemical reaction, 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'?

In a consecutive reaction system given below, when E₁ is much greater than E₂, the yield of B increases with the

For the irreversible elementary reactions in parallel like given below, the rate of disappearance of 'X' is equal to

For a reaction of the following type, the rate of reaction (- rₓ) is given by

What is the value of 'n' if the reaction rate of the chemical reaction A → B, is proportional to CAn and it is found that the reaction rate triples, when the concentration of 'A' is increased 9 times ?

The rate of the reaction, X → Y, quadruples when the concentration of 'X' is doubled. The rate expression for the reaction is, r = K Cxn, the value of 'n' in this case will be

The rate of the chemical reaction A → B doubles as the concentration of A i.e.., CA is doubled. If rate of reaction is proportional to CAn, then what is the value of n for this reaction?

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

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

To maximise the formation of R in the simultaneous reactionA + B → R , rR = 2CA0.5.CB2A + B → S , rS = 1.5 CA . CBWe should have

At a given temperature, K₁, K₂ and K3 are equilibrium constants for the following reactions 1, 2, 3 respectively.CH₄(g) + H₂O(g) ⇋ CO(g) + 3H₂(g),CO(g) + H₂O(g) ⇋ CO₂(g) + H₂(g)CH₄(g) + 2H₂O(g) ⇋ CO₂(g) + 4H₂(g)Then K₁, K₂ and K3 are related as:

Find a mechanism that is consistent with the rate equation and reaction given below: 2A + B → A₂B, ( - rA) = k.CA.CB

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

During manufacture of H₂SO₄, the oxidation of SO₂ to SO₃ by oxygen is an en- dothermic reaction. The yield of SO₃ will be maximised, if the

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)

The following gas phase reactions are carried out isothermally in a CSTR.A → 2R ; r₁ = K₁pA ;K₁ = 20mole/(sec.m³ bar)A → 3S ; r₂ = K₂ pA ;K₂ = 40mole/ (sec.m³ .bar)What is the maximum possible value of FR(mole/sec.) ?

The reaction rate almost gets doubled for 10°C rise in temperature. This is due to the fact that the

The rate of the heterogenous catalytic reaction A(g) + B(g) ? C(g) is given by -rA = k.KA.pA.PB/(1 + KA.PA + Kc.pc), where KA and Kc are the adsorption equilibrium constants. The rate controlling step for this reaction isA. absorption of A.

If the pore diffusion controls in a catalytic reaction, the apparent activation energy Ea is equal to

The irreversible reaction, X → Y, is the special case of the reversible reaction, X ⇋ Y, in which the

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

The rate of a chemical reaction is almost doubled for every 10°C rise in temperature. The rate will increase __________ times, if the temperature rises form 10 to 100°C.

Which of the following does not produce a change in the value of rate constant of a reaction?

In case of calcination of limestone, CaCO₃ CaO + CO₂, the addition of more of CaO will result in __________ in the concentration of CO₂.