Which of the following is not a dimension-less group used in catalysis ? (where, D = dispersion co-efficient, cm 2 /sec. D 1 = diffusion co-efficient; cm 2 /sec L = length of the reactor, cm t = time, sec, v = volumetric flow rate, cm 3 /sec . V = volume, cm 3 .)

Reactor dispersion number ( D / vL )

For a heterogenous catalytic reaction, A + B C , with equimole feed of A and B , the initial rate - r A0 is invariant with total pressure. The rate controlling step is

surface K c /(1 + T S ) 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 .

The rate of an autocatalytic reaction, , is given by - r A = k . C A . C B . In this case, the

plot of - r A Vs C A is a straight line with slope k .

plot of - r A Vs C A is a hyperbola.

rate of disappearance of reactant A is maximum, where C A = C B

Calcination reaction of limestone (CaCO 3 CaO + CO 2 ) goes to completion in the rotary kiln, because

of high calcination temperature.

CaO is more stable than CaCO 3 .

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

k ? = X A (1 + X A )/(1 + X A )

During manufacture of H 2 SO 4 , the oxidation of SO 2 to SO 3 by oxygen is an en-dothermic reaction. The yield of SO 3 will be maximised, if the

temperature is increased and pressure is reduced.

temperature is reduced and pressure is increased.

Considering the endotheomic dissociation of CaCO 3 in a closed vessel (CaCO 3 CaO + CO 2 ), the pressure of CO 2 increases, if

an inert gas is pumped keeping the temperature constant.

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 .

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 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.

In the reversible reaction of the type, A + B AB , in general

the combination reaction will be endothermic, while the dissociation reaction will be exothermic.

both forward and backward reactions will be exothermic.

neither of the reactions will be en-dothermic.

the combination reaction will be exothermic, while the dissociation reaction will be endothermic.

the combination reaction will be endothermic, while the dissociation reaction will be exothermic.

In the gaseous phase ammonia formation reaction (N 2 + 3H 2 2NH 3 ), the value of the equilibrium constant depends on the

initial concentration of N 2 and H 2 .

A chemical reaction, A 3 B , 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

119 + Mcqs in Chemical Reaction Engineering in Chemical Engineering Page 2 McqOptions

51.	Half life period of decomposition of a liquid ' A ' by irreversible first order reaction is 12 minutes. The time required for 75% conversion of ' A ' is __________ minutes.
A.	18
B.	24
C.	6
D.	12
Answer» C. 6

Discussion

52.	Which of the following is not a dimension-less group used in catalysis ? (where, D = dispersion co-efficient, cm 2 /sec. D 1 = diffusion co-efficient; cm 2 /sec L = length of the reactor, cm t = time, sec, v = volumetric flow rate, cm 3 /sec . V = volume, cm 3 .)
A.	Reactor dispersion number ( D / vL )
B.	Reduced time
C.	Thiele modulus
D.	None of these
Answer» E.

Discussion

53.	For a heterogenous catalytic reaction, A + B C , with equimole feed of A and B , the initial rate - r A0 is invariant with total pressure. The rate controlling step is
A.	surface K c /(1 + T S ) 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

54.	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

55.	An irreversible aqueous phase reaction, A + B P , is carried out in an adiabatic mixed flow reactor. A feed containing 4kmole/m 3 of each A and B enters the reactor at 8m 3 /hr. If the temperature of the exit stream is never to exceed 390 K, what is the maximum inlet feed temperature allowed? Data: Heat of reaction = - 50 kJ/mole Density of the reacting mixture = 1000kg/m 3 Specific heat of reacting mixture = 2kJ/kg.K The above data can be assumed to be independent of temperature and composition.
A.	190
B.	290
C.	390
D.	490
Answer» C. 390

Discussion

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

Discussion

57.	Molecularity of an elementary reaction, P + Q R + S is
A.	1
B.	2
C.	3
D.	4
Answer» E.

Discussion

58.	Calcination reaction of limestone (CaCO 3 CaO + CO 2 ) goes to completion in the rotary kiln, because
A.	CaO is not dissociated.
B.	CO 2 escapes continuously.
C.	of high calcination temperature.
D.	CaO is more stable than CaCO 3 .
Answer» C. of high calcination temperature.

Discussion

59.	In case of calcination of limestone, CaCO3 CaO + CO 2 , the addition of more of CaO will result in __________ in the concentration of CO 2 .
A.	no change
B.	increase
C.	decrease
D.	unpredictable from the data
Answer» B. increase

Discussion

60.	The point selectivity of the product ' Y ' in the reaction, is equal to
A.	K 1 / K 2
B.	K 2 / K 1
C.	K 1 - K 2
D.	K 2 - K 1
Answer» B. K 2 / K 1

Discussion

61.	In which of the following reactions, the equilibrium will shift to the right, if the total pressure is increased?
A.	H 2 + Cl 2 2HCl
B.	N 2 + O 2 2NO
C.	N 2 O 4 2 NO 2
D.	H 2 + I 2 2HI
Answer» C. N 2 O 4 2 NO 2

Discussion

62.	An elementary liquid phase decomposition reaction is to be carried out in a CSTR. The design equation is
A.	k ? = X A /(1 - X A )
B.	k ? = X A (1 + X A )/(1 + X A )
C.	k ? = X A /(1 - X A ) 2
D.	-
Answer» B. k ? = X A (1 + X A )/(1 + X A )

Discussion

63.	During manufacture of H 2 SO 4 , the oxidation of SO 2 to SO 3 by oxygen is an en-dothermic reaction. The yield of SO 3 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

64.	The time needed to achieve the same fractional conversion for particles of different sizes ( d ) when chemical reaction controls, is proportional to
A.	d
B.	d
C.	d 1.5
D.	d 2
Answer» D. d 2

Discussion

65.	For the irreversible elementary first order reaction in parallel viz . , a plot of C y Vs . C z will give a straight line having a slope of
A.	K 2 / K 1
B.	K 1 / K 2
C.	K 1 . K 2
D.	K 1 + K 2
Answer» C. K 1 . K 2

Discussion

66.	In the converter of the contact process for the manufacture of H 2 SO 4 the equilibrium conversion of SO 2 __________ (A) __________ with increase in temperature and __________ (B) __________ with increase in the mole ratio of SO 2 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

67.	From Arhenius law, a plot of log e 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/Â° K
C.	Â° K
D.	k cal. Â° K
Answer» D. k cal. Â° K

Discussion

68.	Considering the endotheomic dissociation of CaCO 3 in a closed vessel (CaCO 3 CaO + CO 2 ), the pressure of CO 2 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

69.	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 .
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

70.	Consider the 'n' th order irreversible liquid phase reaction A B . Which one of the following plots involving half life of the reaction ( t 1/2 ) and the initial reactant concentration ( C A 0 ) gives a straight line plot ?
A.	C A 0 Vs t 1/2
B.	ln C A 0 Vs t 1/2
C.	C A 0 Vs ln t 1/2
D.	ln C A 0 Vs ln t 1/2
Answer» D. ln C A 0 Vs ln t 1/2

Discussion

71.	An isothermal aqueous phase reversible reaction, P R , is to be carried out in a mixed flow reactor. The reaction rate in k.mole/m 3 .h is given by, r = 0.5 C P - 0.125 C R . A stream containing only P enters the reactor. The residence time required (in hours) for 40% conversion of P is
A.	0.80
B.	1.33
C.	1.60
D.	2.67
Answer» D. 2.67

Discussion

72.	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 C p n , then what is the value of ' n ' for this chemical reaction ?
A.	1
B.	2
C.	3
D.	0
Answer» B. 2

Discussion

73.	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

74.	Second order consecutive irreversible reactions 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 ( k 1 / k 2 )?
A.	1/4
B.	1/2
C.	2
D.	4
Answer» B. 1/2

Discussion

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

Discussion

76.	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

77.	In the reversible reaction of the type, A + B AB , in general
A.	both forward and backward reactions will be exothermic.
B.	neither of the reactions will be en-dothermic.
C.	the combination reaction will be exothermic, while the dissociation reaction will be endothermic.
D.	the combination reaction will be endothermic, while the dissociation reaction will be exothermic.
Answer» D. the combination reaction will be endothermic, while the dissociation reaction will be exothermic.

Discussion

78.	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: C A 0 = 5 kmole/m 3 ; X A = 0.5; Feed temperature = reactor temperature = 40Â°C. Rate constant at 40Â°C = 1 min -1 ; (? H ) = - 40kJ/mole; ? = 1000kg/m 3 C P = 4 J/gm.Â°C ; q = 10 -3 m 3 /min (? and C P 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

79.	In the gaseous phase ammonia formation reaction (N 2 + 3H 2 2NH 3 ), the value of the equilibrium constant depends on the
A.	total pressure of the system.
B.	volume of the reactor.
C.	temperature.
D.	initial concentration of N 2 and H 2 .
Answer» D. initial concentration of N 2 and H 2 .

Discussion

80.	In a chemical reaction , 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

81.	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

82.	The reaction A B is conducted in an adiabatic plug flow reactor (PFR). Pure A at a concentration of 2 kmol/m 3 is fed to the reactor at the rate of 0.01 m 3 /s and at a temperature of 500 K. If the exit conversion is 20%, then the exit temperature (in k)is (Data: Heat of reaction at 298 K = - 50000 kJ/ kmole of A reacted Heat capacities C PA = C PB = 100kJ/kmole. K (may be assumed to be independent of temperature))
A.	400
B.	500
C.	600
D.	1000
Answer» D. 1000

Discussion

83.	Pure ethanol vapor is fed to a reactor packed with alumina catalyst, at the rate of 100 kmole / hr. The reactor products comprise: ethylene :95 kmole / hr, water vapour: 97.5 k mole / hr and diethyl ether :2.5 kmole/hr. The reactions occuring can be represented by: C 2 H 5 OH C 2 H 4 + H 2 O 2C 2 H 5 OH C 2 H 5 - O - C 2 H 5 + H 2 O The percent conversion of ethanol in the reactor is
A.	100
B.	97.5
C.	95
D.	2.5
Answer» B. 97.5

Discussion

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

Discussion

85.	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

86.	Given, 3H 2 + CO = CH 4 + H 2 O, K P = 10 1.84 and, 4H 2 + CO 2 = CH 4 + 2H 2 O, K P = 10 1.17 the K P for the reaction CO + H 2 O = CO 2 + H 2 is
A.	10 3.01
B.	10 -0.67
C.	10 -3.01
D.	l0 0.67
Answer» E.

Discussion

87.	The rate expression for a heterogenous catalytic reaction is given by, - r A = K . K A P A (1 + K A . P A + K R . P R ), where K is surface reaction rate constant and K A and K R are absorption equilibrium constants of A and R respectively. If K R P R >> (1 + K A P A ), the apparent activation energy E A is equal to (given E is the activation energy for the reaction and ? H R and ? H A are the activation energies of adsorption of R and A )
A.	E
B.	E + ? H A
C.	E + ? H A - ? H R )
D.	? H A + ? H R
Answer» D. ? H A + ? H R

Discussion

88.	The value of steric factor 'P' in the equation k = PZ e E / RT usually ranges from
A.	l.0 to 10 -8
B.	l.l.to 10 2
C.	0.1 to 0.9
D.	none of these
Answer» B. l.l.to 10 2

Discussion

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

Discussion

90.	The conversion X A 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.	X A Vs . ?
B.	X A Vs ln ?
C.	X A /(1 - X A ) Vs ?
D.	X A (1 - X A ) Vs ?
Answer» B. X A Vs ln ?

Discussion

91.	In chamber process of sulphuric acid manufacture in industry, the gas phase oxidation of SO 2 to SO 3 is accomplished by a __________ reaction.
A.	non-catalytic homogeneous
B.	non-catalytic heterogeneous
C.	catalytic homogenous
D.	catalytic heterogeneous
Answer» D. catalytic heterogeneous

Discussion

92.	A chemical reaction, A 3 B , 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

93.	To maximise the formation of R in the simultaneous reaction A + B R , r R = 2 C A 0.5 . C B 2 A + B S , r S = 1.5 C A . C B We should have
A.	low C A , low C B
B.	low C A , high C B
C.	high C A , low C B
D.	high C A , high C B
Answer» C. high C A , low C B

Discussion

94.	Three plug flow reactors (PFR's) of 4, 5 & 6 m 3 volumes are arranged in two branches as shown below in the figure. If the total feed rate is 300 tons/hr, then for the same conversion in each branch, the feed rate through branch II should be __________ tons/hr.
A.	100
B.	150
C.	200
D.	225
Answer» B. 150

Discussion

95.	For identical flow rate, feed composition and for elementary first order reactions, ' N ' equal sized mixed reactors in series with a total volume ' V ' gives the same conversion as a single plug flow reactor of volume ' V ' for constant density systems. This is true, when the value of ' N ' is
A.	1
B.	>1
C.	?
D.	?1
Answer» D. ?1

Discussion

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

Discussion

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

Discussion

98.	For the liquid phase zero order irreversible reaction A B , the conversion of A in a CSTR is found to be 0.3 at a space velocity of 0.1min -1 . What will be the conversion for a PFR with a space velocity of 0.2 min -1 ? Assume that all the other operating conditions are the same for CSTR and PFR.
A.	0.15
B.	0.30
C.	0.60
D.	0.90
Answer» D. 0.90

Discussion

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

Discussion

100.	If in the gaseous phase reaction, N 2 O 4 2NO 2 , x is the part of N 2 O 4 which dissociates, then the number of molecules at equilibrium will be
A.	(1 + x)
B.	(1 - x)
C.	(1 + x) 2
D.	(1 - x) 2
Answer» B. (1 - x)

Discussion

Explore topic-wise MCQs in Chemical Engineering.

Half life period of decomposition of a liquid ' A ' by irreversible first order reaction is 12 minutes. The time required for 75% conversion of ' A ' is __________ minutes.

Which of the following is not a dimension-less group used in catalysis ? (where, D = dispersion co-efficient, cm 2 /sec. D 1 = diffusion co-efficient; cm 2 /sec L = length of the reactor, cm t = time, sec, v = volumetric flow rate, cm 3 /sec . V = volume, cm 3 .)

For a heterogenous catalytic reaction, A + B C , with equimole feed of A and B , the initial rate - r A0 is invariant with total pressure. The rate controlling step is

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

The rate of an autocatalytic reaction, , is given by - r A = k . C A . C B . In this case, the

Molecularity of an elementary reaction, P + Q R + S is

Calcination reaction of limestone (CaCO 3 CaO + CO 2 ) goes to completion in the rotary kiln, because

In case of calcination of limestone, CaCO3 CaO + CO 2 , the addition of more of CaO will result in __________ in the concentration of CO 2 .

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

In which of the following reactions, the equilibrium will shift to the right, if the total pressure is increased?

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

During manufacture of H 2 SO 4 , the oxidation of SO 2 to SO 3 by oxygen is an en-dothermic reaction. The yield of SO 3 will be maximised, if the

The time needed to achieve the same fractional conversion for particles of different sizes ( d ) when chemical reaction controls, is proportional to

For the irreversible elementary first order reaction in parallel viz . , a plot of C y Vs . C z will give a straight line having a slope of

In the converter of the contact process for the manufacture of H 2 SO 4 the equilibrium conversion of SO 2 __________ (A) __________ with increase in temperature and __________ (B) __________ with increase in the mole ratio of SO 2 to air.

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

Considering the endotheomic dissociation of CaCO 3 in a closed vessel (CaCO 3 CaO + CO 2 ), the pressure of CO 2 increases, if

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 .

Consider the 'n' th order irreversible liquid phase reaction A B . Which one of the following plots involving half life of the reaction ( t 1/2 ) and the initial reactant concentration ( C A 0 ) gives a straight line plot ?

An isothermal aqueous phase reversible reaction, P R , is to be carried out in a mixed flow reactor. The reaction rate in k.mole/m 3 .h is given by, r = 0.5 C P - 0.125 C R . A stream containing only P enters the reactor. The residence time required (in hours) for 40% conversion of P is

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 C p n , then what is the value of ' n ' for this chemical reaction ?

A chemical reaction is of zero order, when the reaction rate is (where, C A = concentration of reactant)

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

In the reversible reaction of the type, A + B AB , in general

In the gaseous phase ammonia formation reaction (N 2 + 3H 2 2NH 3 ), the value of the equilibrium constant depends on the

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

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

Given, 3H 2 + CO = CH 4 + H 2 O, K P = 10 1.84 and, 4H 2 + CO 2 = CH 4 + 2H 2 O, K P = 10 1.17 the K P for the reaction CO + H 2 O = CO 2 + H 2 is

The value of steric factor 'P' in the equation k = PZ e E / RT usually ranges from

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

The conversion X A 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 ?

In chamber process of sulphuric acid manufacture in industry, the gas phase oxidation of SO 2 to SO 3 is accomplished by a __________ reaction.

A chemical reaction, A 3 B , 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

To maximise the formation of R in the simultaneous reaction A + B R , r R = 2 C A 0.5 . C B 2 A + B S , r S = 1.5 C A . C B We should have

Three plug flow reactors (PFR's) of 4, 5 & 6 m 3 volumes are arranged in two branches as shown below in the figure. If the total feed rate is 300 tons/hr, then for the same conversion in each branch, the feed rate through branch II should be __________ tons/hr.

For identical flow rate, feed composition and for elementary first order reactions, ' N ' equal sized mixed reactors in series with a total volume ' V ' gives the same conversion as a single plug flow reactor of volume ' V ' for constant density systems. This is true, when the value of ' N ' is

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

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

For the liquid phase zero order irreversible reaction A B , the conversion of A in a CSTR is found to be 0.3 at a space velocity of 0.1min -1 . What will be the conversion for a PFR with a space velocity of 0.2 min -1 ? Assume that all the other operating conditions are the same for CSTR and PFR.

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

If in the gaseous phase reaction, N 2 O 4 2NO 2 , x is the part of N 2 O 4 which dissociates, then the number of molecules at equilibrium will be

In the converter of the contact process for the manufacture of H 2 SO 4 the equilibrium conversion of SO 2 (A) with increase in temperature and (B) with increase in the mole ratio of SO 2 to air.