For a heterogenous catalytic reaction, A + B → C, with equimole feed of A and B, the initial rate - rᴀ₀ is invariant with total pressure. The rate controlling step is

surface Kc/(1 + Tₛ) reaction between absorbed A and B in the gas phase.

surface reaction between absorbed A and absorbed B.

surface reaction between A in the gas phase and absorbed B.

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?

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.

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

Which of the following holds good for an elementary reaction given below:

The rate of disappearance of 'X' is equal to the rate of appearance of 'Z'.

The rate of disappearance of 'Y' is equal to the rate of appearance of 'Z'.

The rate of disappearance of 'Y' is equal to the rate of disappearance of 'X'.

Three times the rate of disappearance of 'X' is equal to the rate of appearance of 'Z'.

The rate of disappearance of 'X' is equal to the rate of appearance of 'Z'.

The concentration of A in a first order reaction, A → B, decreases

very abruptly towards the end of the reaction.

On application of pressure to the equilibrium system, ice ↔ water ; which of the following phenomenon will occur ?

Equilibrium will not be attained

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

data insufficient, can't be predicted

The experimentally determined overall order of the reaction, A + B → C + D, is two. Then the

molecularity of the reaction is 2, but the reaction may not be elementary.

reaction is elementary with a molecularity of 2.

molecularity of the reaction is 2, but the reaction may not be elementary.

reaction may be elementary with molecularity of 2.

reaction is elementary but the molecularity may not be 2.

Considering the endotheomic dissociation of CaCO₃ in a closed vessel (CaCO₃ ↔ CaO + CO₂), the pressure of CO₂ increases, if

an inert gas is pumped keeping the temperature constant.

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

the intrinsic activation energy E.

(E + Eᴅ) where Eᴅ is activation due to diffusion.

Calcination reaction of limestone (CaCO₃ → CaO + CO₂) goes to completion in the rotary kiln, because

of high calcination temperature.

CaO is more stable than CaCO₃.

1443 + Mcqs in Chemical Reaction Engineering in Chemical Engineering Page 4 McqOptions

151.	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.	3 = K₁.K₂
B.	3 = (K₁.K₂)0.5
C.	3(K₁+K₂)/2
D.	3 = (K₁.K₂)2
Answer» B. 3 = (K₁.K₂)0.5

Discussion

152.	An isothermal aqueous phase reversible reaction, P ⇋ R, is to be carried out in a mixed flow reactor. The reaction rate in k.mole/m³ .h is given by, r = 0.5CP - 0.125CR. A stream containing only P enters the
A.	0.8
B.	0.33
C.	0.6
D.	0.67
Answer» D. 0.67

Discussion

153.	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.	0
B.	5
C.	0
D.	00
Answer» C. 0

Discussion

154.	With increase in K₂/K₁ in case of a unimolecular type elementary reactions given below, the fractional yield of 'R' in mixed reactor (for a given conversion of 'A')
A.	decreases
B.	increases
C.	increases linearly
D.	remains same
Answer» B. increases

Discussion

155.	If n = overall order of a chemical reaction, a = initial concentration of reactant, t = time required to complete a definite fraction of the reaction. Then pick out the correct relationship.
A.	A
B.	B
C.	C
D.	D
Answer» C. C

Discussion

156.	The order of the chemical reaction given below, whose rate equation is given as -rᴀ = KCᴀ². Cʙ is
A.	0
B.	1
C.	2
D.	3
Answer» E.

Discussion

157.	Consider a reversible exothermic reaction in a plug flow reactor. The maximum and minimum permissible temperatures are Tₘₐₓ and Tₘᵢₙ respectively. Which of the following temperature (T) profiles will require the shortest residence time to achieve the desired conversion.
A.	A
B.	B
C.	C
D.	D
Answer» C. C

Discussion

158.	For a __________ order chemical reaction given below, the fractional conversion of reactant 'A' is proportional to time.
A.	zero
B.	first
C.	second
D.	third
Answer» B. first

Discussion

159.	For a heterogenous catalytic reaction, A + B → C, with equimole feed of A and B, the initial rate - rᴀ₀ is invariant with total pressure. The rate controlling step is
A.	surface Kc/(1 + Tₛ) reaction between absorbed A and B in the gas phase.
B.	surface reaction between absorbed A and absorbed B.
C.	surface reaction between A in the gas phase and absorbed B.
D.	desorption of C.
Answer» E.

Discussion

160.	Fractional conversion __________ with increase in pressure for ammonia synthesis reaction i.e., N₂ + 3H₂ ↔ 2NH₃.
A.	increases
B.	decreases
C.	remains unchanged
D.	unpredictable from the data
Answer» B. decreases

Discussion

161.	For the reversible reaction A ↔ 2B, if the equilibrium constant K is 0.05 mole/litre; starting from initially 2 moles of A and zero moles of B, how many moles will be formed at equilibrium ?
A.	0.253
B.	0.338
C.	0.152
D.	0.637
Answer» C. 0.152

Discussion

162.	In the converter of the contact process for the manufacture of H₂SO₄ the equilibrium conversion of SO₂ __________ (A) __________ with increase in temperature and __________ (B) __________ with increase in the mole ratio of SO₂ to air.
A.	(A) increases (B) decreases
B.	(A) decreases (B) increases
C.	(A) increases (B) increases
D.	(A) decreases (B) decreases
Answer» C. (A) increases (B) increases

Discussion

163.	To maximise the formation of R in the simultaneous reactionA + B → R , rʀ = 2Cᴀ^0.5.Cʙ² A + B → S , rₛ = 1.5 Cᴀ . CʙWe should have
A.	low Cᴀ, low Cʙ
B.	low Cᴀ, high Cʙ
C.	high Cᴀ, low Cʙ
D.	high Cᴀ, high Cʙ
Answer» C. high Cᴀ, low Cʙ

Discussion

164.	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.
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.	Effectiveness 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

165.	For the chemical reaction X → Y, it is observed that, on doubling the concentration of 'X', the reaction rate quadruples. If the reaction rate is proportional to Cₓⁿ, then what is the value of 'n' ?
A.	4
B.	1/4
C.	16
D.	2
Answer» B. 1/4

Discussion

166.	The conversion Xᴀ 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.	Xᴀ Vs τ
B.	Xᴀ Vs ln τ
C.	Xᴀ/(1 - Xᴀ) Vs τ
D.	Xᴀ(1 - Xᴀ) Vs τ
Answer» B. Xᴀ Vs ln τ

Discussion

167.	A chemical reaction is of zero order, when the reaction rate is (where, Cᴀ = concentration of reactant)
A.	∝ Cᴀ.
B.	∝ 1/Cᴀ.
C.	independent of temperature.
D.	none of these.
Answer» E.

Discussion

168.	The first order series reaction given below, is conducted in a batch reactor. The initial concentrations of A, B and C (Cᴀ₀, Cʙ₀, Cc₀ respectively) are all non-zero. The variation of Cʙ with reaction time will not show a maximum, if
A.	k₂ Cʙ₀ > k₁ Cᴀ₀
B.	k Cᴀ₀ > k₂.Cʙ₀
C.	Cʙ₀ > Cᴀ₀
D.	Cᴀ₀ > Cʙ₀
Answer» B. k Cᴀ₀ > k₂.Cʙ₀

Discussion

169.	Which of the following holds good for an elementary reaction given below:
A.	The rate of disappearance of 'Y' is equal to the rate of appearance of 'Z'.
B.	The rate of disappearance of 'Y' is equal to the rate of disappearance of 'X'.
C.	Three times the rate of disappearance of 'X' is equal to the rate of appearance of 'Z'.
D.	The rate of disappearance of 'X' is equal to the rate of appearance of 'Z'.
Answer» D. The rate of disappearance of 'X' is equal to the rate of appearance of 'Z'.

Discussion

170.	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.	A
B.	B
C.	C
D.	D
Answer» B. B

Discussion

171.	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.	1/2
B.	1/3
C.	1/4
D.	1/5
Answer» C. 1/4

Discussion

172.	The concentration of A in a first order reaction, A → B, decreases
A.	linearly with time.
B.	exponentially with time.
C.	very abruptly towards the end of the reaction.
D.	logarithmically with time.
Answer» C. very abruptly towards the end of the reaction.

Discussion

173.	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
C.	1.5
D.	2
Answer» B. 1

Discussion

174.	A batch adiabatic reactor at an initial temperature of 373°K is being used for the reaction, A → B. Assume the heat of reaction is - 1 kJ/mole at 373°K and heat capacity of both A and B to be constant and equal to 50 J/mole.K. The temperature rise after a conversion of 0.5 will be
A.	5°C
B.	10°C
C.	20°C
D.	100°C
Answer» C. 20°C

Discussion

175.	Half life period of a first order irreversible reaction A → B is
A.	k/2
B.	ln k/2
C.	ln 2/k
D.	ln 0.5/k
Answer» D. ln 0.5/k

Discussion

176.	On application of pressure to the equilibrium system, ice ↔ water ; which of the following phenomenon will occur ?
A.	Water will evaporate
B.	Equilibrium will not be attained
C.	More ice will be formed
D.	More water will be formed.
Answer» E.

Discussion

177.	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.	60
B.	75
C.	90
D.	100
Answer» C. 90

Discussion

178.	A second order reaction of the form A + B → C is called a pseudo-first order reaction, when
A.	Cᴀ₀ = Cʙ₀
B.	Cᴀ₀ > Cʙ₀
C.	Cʙ₀ > Cᴀ₀
D.	Cʙ₀ ≥ Cᴀ₀
Answer» E.

Discussion

179.	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 Cᴀ/Cᴀ₀ at the outlet of the reactor is
A.	2/3
B.	5/8
C.	1/3
D.	3/8
Answer» C. 1/3

Discussion

180.	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.	0.33
B.	0.5
C.	1
D.	data insufficient, can't be predicted
Answer» D. data insufficient, can't be predicted

Discussion

181.	For reaction, P + 2 → 3R, molar rate of consumption of P is
A.	double of that of Q.
B.	same as that of Q.
C.	half of that of Q.
D.	2/3rd of that of Q.
Answer» D. 2/3rd of that of Q.

Discussion

182.	The experimentally determined overall order of the reaction, A + B → C + D, is two. Then the
A.	reaction is elementary with a molecularity of 2.
B.	molecularity of the reaction is 2, but the reaction may not be elementary.
C.	reaction may be elementary with molecularity of 2.
D.	reaction is elementary but the molecularity may not be 2.
Answer» B. molecularity of the reaction is 2, but the reaction may not be elementary.

Discussion

183.	The fractional volume change between no conversion and complete conversion, for the isothermal gas phase reaction, 2A → R, is
A.	0.5
B.	-0.5
C.	1
D.	1.5
Answer» C. 1

Discussion

184.	A CSTR is to be designed in which an exothermic liquid phase first order reaction of the type, A → R, is taking place. The reactor is to be provided with a jacket in which coolant is flowing. Following data is given: Cᴀ₀ = 5 kmole/m³ ; Xᴀ = 0.5; Feed temperature = reactor temperature = 40°C. Rate constant at 40°C = 1 min⁻¹ ; (ΔH) = - 40kJ/mole; ρ = 1000kg/m³ ,CP = 4 J/gm.°C ; q = 10⁻³ m³/min (ρ and CP are same for the reactant and product streams). The amount of heat to be removed is
A.	2/3 kW
B.	1kW
C.	5/3 kW
D.	4kW
Answer» D. 4kW

Discussion

185.	In a chemical reaction, repesented by, A → B , it is observed that the(i) rate of reaction increases by a factor of 4 on doubling the concentration of the reactant. (ii) rate of reaction increases by a factor of 9 on trebling the concentration of the reactant. Then the rate of the reaction is proportional to(where, Cᴀ = contentration of the reactant)
A.	Cᴀ
B.	Cᴀ²
C.	Cᴀ³
D.	Cᴀ⁴
Answer» C. Cᴀ³

Discussion

186.	Considering the endotheomic dissociation of CaCO₃ in a closed vessel (CaCO₃ ↔ CaO + CO₂), the pressure of CO₂ increases, if
A.	a catalyst is added.
B.	the temperature is increased.
C.	an inert gas is pumped keeping the temperature constant.
D.	none of these.
Answer» C. an inert gas is pumped keeping the temperature constant.

Discussion

187.	In case of calcination of limestone, CaCO₃CaO + 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

188.	For the reaction, A + B → 2B + C,
A.	rᴀ = rʙ
B.	rᴀ = -rʙ
C.	rᴀ = 2rʙ
D.	rᴀ = rʙ/2
Answer» C. rᴀ = 2rʙ

Discussion

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

Discussion

190.	For an isothermal second order aqueous phase reaction, A → B, the ratio of the time required for 90% conversion to the time required for 45% conversion is
A.	2
B.	4
C.	11
D.	22
Answer» D. 22

Discussion

191.	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.	100%
B.	95%
C.	75%
D.	20%
Answer» C. 75%

Discussion

192.	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 + Eᴅ) where Eᴅ is activation due to diffusion.
C.	(E + Eᴅ)/2
D.	Eᴅ/2
Answer» E.

Discussion

193.	From Arhenius law, a plot of logₑ K versus 1/T gives a straight line with a slope of (-E/R). The unit of E/R is
A.	k cal
B.	k cal/°K
C.	°K
D.	k cal. °K
Answer» D. k cal. °K

Discussion

194.	For a gaseous phase reaction, rate of reaction is equal to K. Cᴀ . Cʙ. If the volume of the reactor is suddenly reduced to 1/4th of its initial volume, then the rate of reaction compared to the original rate will be __________ times.
A.	8
B.	16
C.	1/8
D.	1/16
Answer» C. 1/8

Discussion

195.	For the chemical reaction P → Q, it is found that the rate of reaction doubles as the concentration of 'P' is doubled. If the reaction rate is proportional to Cₚⁿ, then what is the value of 'n' for this chemical reaction ?
A.	1
B.	2
C.	3
D.	0
Answer» B. 2

Discussion

196.	The following gas phase reaction is taking place in a plug flow reactor.A stoichiometric mixture of A and B at 300 K is fed to the reactor. At 1 m along the length of the reactor, the temperature is 360 K. The pressure drop is negligible and an ideal gas behaviour can be assumed. Identify the correct expression relating the concentration of A at the inlet (Cᴀ₀), concentration of A at 1m (Cᴀ) and the corresponding conversion of A (X).
A.	A
B.	B
C.	C
D.	D
Answer» D. D

Discussion

197.	The rate expression for a heterogenous catalytic reaction is given by, - rᴀ = K.Kᴀ Pᴀ(1 + Kᴀ.Pᴀ + Kʀ.Pʀ), where K is surface reaction rate constant and Kᴀ and Kʀ are absorption equilibrium constants of A and R respectively. If Kʀ Pʀ >> (1 + Kᴀ Pᴀ), the apparent activation energy Eᴀ is equal to (given E is the activation energy for the reaction and ΔHʀ and ΔHᴀ are the activation energies of adsorption of R and A)
A.	E
B.	E + ΔHᴀ
C.	E + ΔHᴀ - ΔHʀ)
D.	ΔHᴀ + ΔHʀ
Answer» D. ΔHᴀ + ΔHʀ

Discussion

198.	The dimensions of rate constant for reaction 3A → B are (l/gm mole)/min. Therefore the reaction order is
A.	0
B.	1
C.	2
D.	3
Answer» D. 3

Discussion

199.	Calcination reaction of limestone (CaCO₃ → CaO + CO₂) goes to completion in the rotary kiln, because
A.	CaO is not dissociated.
B.	CO₂ escapes continuously.
C.	of high calcination temperature.
D.	CaO is more stable than CaCO₃.
Answer» C. of high calcination temperature.

Discussion

200.	The following gas phase reactions are carried out isothermally in a CSTR.A → 2R ; r₁ = k₁pᴀ ;k₁ = 20 mole/(sec.m³ bar)A → 3S ; r₂ = k₂ pᴀ ;k₂ = 40 mole/(sec.m³ .bar)What is the maximum possible value of Fʀ(mole/sec.) ?
A.	1/3
B.	1/2
C.	2/3
D.	2
Answer» D. 2

Discussion

Explore topic-wise MCQs in Chemical Engineering.

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:

An isothermal aqueous phase reversible reaction, P ⇋ R, is to be carried out in a mixed flow reactor. The reaction rate in k.mole/m³ .h is given by, r = 0.5CP - 0.125CR. A stream containing only P enters the

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

With increase in K₂/K₁ in case of a unimolecular type elementary reactions given below, the fractional yield of 'R' in mixed reactor (for a given conversion of 'A')

If n = overall order of a chemical reaction, a = initial concentration of reactant, t = time required to complete a definite fraction of the reaction. Then pick out the correct relationship.

The order of the chemical reaction given below, whose rate equation is given as -rᴀ = KCᴀ². Cʙ is

Consider a reversible exothermic reaction in a plug flow reactor. The maximum and minimum permissible temperatures are Tₘₐₓ and Tₘᵢₙ respectively. Which of the following temperature (T) profiles will require the shortest residence time to achieve the desired conversion.

For a __________ order chemical reaction given below, the fractional conversion of reactant 'A' is proportional to time.

For a heterogenous catalytic reaction, A + B → C, with equimole feed of A and B, the initial rate - rᴀ₀ is invariant with total pressure. The rate controlling step is

Fractional conversion __________ with increase in pressure for ammonia synthesis reaction i.e., N₂ + 3H₂ ↔ 2NH₃.

For the reversible reaction A ↔ 2B, if the equilibrium constant K is 0.05 mole/litre; starting from initially 2 moles of A and zero moles of B, how many moles will be formed at equilibrium ?

In the converter of the contact process for the manufacture of H₂SO₄ the equilibrium conversion of SO₂ __________ (A) __________ with increase in temperature and __________ (B) __________ with increase in the mole ratio of SO₂ to air.

To maximise the formation of R in the simultaneous reactionA + B → R , rʀ = 2Cᴀ^0.5.Cʙ² A + B → S , rₛ = 1.5 Cᴀ . CʙWe should have

For the chemical reaction X → Y, it is observed that, on doubling the concentration of 'X', the reaction rate quadruples. If the reaction rate is proportional to Cₓⁿ, then what is the value of 'n' ?

The conversion Xᴀ 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 chemical reaction is of zero order, when the reaction rate is (where, Cᴀ = concentration of reactant)

The first order series reaction given below, is conducted in a batch reactor. The initial concentrations of A, B and C (Cᴀ₀, Cʙ₀, Cc₀ respectively) are all non-zero. The variation of Cʙ with reaction time will not show a maximum, if

Which of the following holds good for an elementary reaction given below:

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

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

The concentration of A in a first order reaction, A → B, decreases

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 batch adiabatic reactor at an initial temperature of 373°K is being used for the reaction, A → B. Assume the heat of reaction is - 1 kJ/mole at 373°K and heat capacity of both A and B to be constant and equal to 50 J/mole.K. The temperature rise after a conversion of 0.5 will be

Half life period of a first order irreversible reaction A → B is

On application of pressure to the equilibrium system, ice ↔ water ; which of the following phenomenon will occur ?

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 second order reaction of the form A + B → C is called a pseudo-first order reaction, when

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 Cᴀ/Cᴀ₀ at the outlet of the reactor is

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

For reaction, P + 2 → 3R, molar rate of consumption of P is

The experimentally determined overall order of the reaction, A + B → C + D, is two. Then the

The fractional volume change between no conversion and complete conversion, for the isothermal gas phase reaction, 2A → R, is

Considering the endotheomic dissociation of CaCO₃ in a closed vessel (CaCO₃ ↔ CaO + CO₂), the pressure of CO₂ increases, if

In case of calcination of limestone, CaCO₃CaO + CO₂, the addition of more of CaO will result in __________ in the concentration of CO₂.

For the reaction, A + B → 2B + C,

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

For an isothermal second order aqueous phase reaction, A → B, the ratio of the time required for 90% conversion to the time required for 45% conversion is

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 ?

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

From Arhenius law, a plot of logₑ K versus 1/T gives a straight line with a slope of (-E/R). The unit of E/R is

For a gaseous phase reaction, rate of reaction is equal to K. Cᴀ . Cʙ. If the volume of the reactor is suddenly reduced to 1/4th of its initial volume, then the rate of reaction compared to the original rate will be __________ times.

For the chemical reaction P → Q, it is found that the rate of reaction doubles as the concentration of 'P' is doubled. If the reaction rate is proportional to Cₚⁿ, then what is the value of 'n' for this chemical reaction ?

The dimensions of rate constant for reaction 3A → B are (l/gm mole)/min. Therefore the reaction order is

Calcination reaction of limestone (CaCO₃ → CaO + CO₂) goes to completion in the rotary kiln, because

The following gas phase reactions are carried out isothermally in a CSTR.A → 2R ; r₁ = k₁pᴀ ;k₁ = 20 mole/(sec.m³ bar)A → 3S ; r₂ = k₂ pᴀ ;k₂ = 40 mole/(sec.m³ .bar)What is the maximum possible value of Fʀ(mole/sec.) ?

In the converter of the contact process for the manufacture of H₂SO₄ the equilibrium conversion of SO₂ (A) with increase in temperature and (B) with increase in the mole ratio of SO₂ to air.