In contact process, SO 3 is absorbed in 97% H 2 SO 4 and not in water, because

the purity of acid is affected.

SO 3 gas is sparingly soluble in water.

water forms an acid mist, which is difficult to absorb.

the purity of acid is affected.

scale formation in the absorber is to be avoided.

Consider the production of ammonia from methene and air as raw materials. The catalyst used are: ( i ) __________ for steam reforming of methane and ( ii ) __________ for ammonia synthesis.

i - Fe/Al 2 O 3 ; ii - Ni/Al 2 O 3

i - Ni/Al 2 O 3 ; ii - Cu - ZnO/Al 2 O 3

i - Fe/Al 2 O 3 ; ii - Cu - ZnO/Al 2 O 3

i - Ni/Al 2 O 3 ; ii - Fe/Al 2 O 3

i - Fe/Al 2 O 3 ; ii - Ni/Al 2 O 3

Presence of H 2 S in raw water (to be chlorinated) results in the

reduced softening capacity of zeolite.

increased dosage of chlorine to provide a disinfecting residual in the water.

Dry ice (solidified CO 2 ) is used for the

liquefaction of permanent gases.

storage & shipment of frozen foods and ice-creams.

liquefaction of permanent gases.

During the manufacture of sulphuric acid, the temperature of molten sulphur is not increased beyond 160Â°C, as

it decomposes on further increasing the temperature.

it is very corrosive at elevated temperature.

its viscosity is not reduced on further heating (hence pressure drop on pumping it, cannot be further reduced).

it decomposes on further increasing the temperature.

The purpose of adding Na 2 CO 3 to water of low alkalinity is to

increase the softening capacity of zeolite.

permit the use of alum as a coagulant.

increase the softening capacity of zeolite.

facilitate easy regeneration of zeolite.

In multistage equilibrium conversion of SO 2 to SO 3 (2SO 2 + O 2 2SO 3 ), the reverse reaction becomes appreciable at a temperature of 550Â° C. The percentage equilibrium conversion of SO 2 to SO 3 can be increased by

maintaining low temperature & pressure in the converter.

increasing the oxygen concentration.

putting more quantity of V 2 O 5 catalyst in the converter.

removing some quantity of SO 3 during intermediate stage.

maintaining low temperature & pressure in the converter.

Commercial scale production of hydrogen from iron-steam reaction represented by, 3Fe + 3H 2 O = Fe 3 O4 + 4H 2 , is not practised, as it is

a discontinuous reaction (requiring regeneration of iron by water gas intermittently).

still in development stage (by employing fluidised bed technique).

SO 2 is bubbled through hot sugar cane juice to

increase the amount of molasses.

In the manufacture of H 2 SO 4 , vanadium catalyst as compared to platinum catalyst

gives higher conversion efficiency.

has a longer life and is not poisoned by arsenic.

handles lower SO 2 content gas (7 -10% SO 2 ), thus increasing the capital cost of the plant.

Which of the following processes does not produce Cl 2 as a co-product during the manufacture of caustic soda ?

Diaphragm electrolytic cell process

Mercury electrolytic cell process

51 + Mcqs in Chemical Process in Chemical Engineering Page 1 McqOptions

1.	The compressive strength of cement should not be less than about 110Kg/cm 2 after three days & not less than 170Kg/cm 2 after seven days. The fineness of an ordinary cement as determined by turbidimetric method should be about __________ cm 2 /gm.
A.	800
B.	1600
C.	4000
D.	8500
Answer» C. 4000

Discussion

2.	Low temperature carbonisation of coal takes place at __________ Â°C.
A.	300
B.	1100
C.	700
D.	900
Answer» D. 900

Discussion

3.	In contact process, SO 3 is absorbed in 97% H 2 SO 4 and not in water, because
A.	SO 3 gas is sparingly soluble in water.
B.	water forms an acid mist, which is difficult to absorb.
C.	the purity of acid is affected.
D.	scale formation in the absorber is to be avoided.
Answer» C. the purity of acid is affected.

Discussion

4.	In an integrated steel plant, NH 3 present in coke oven gas is normally recovered as
A.	(NH 4 ) 2 SO 4
B.	NH 4 Cl
C.	(NH 4 ) 2 NO 3
D.	liquid NH 3
Answer» B. NH 4 Cl

Discussion

5.	Alum [Al 2 (SO 4 ) 3 ] is used as a coagulant in water treatment to remove
A.	colour
B.	turbidity
C.	bacteria
D.	all (a), (b) and (c)
Answer» E.

Discussion

6.	90% of the caprolactum is converted to nylon-6 on its condensation polymerisation in the reactor maintained at __________ Â°C.
A.	<0
B.	10-30
C.	250-280
D.	500-600
Answer» C. 250-280

Discussion

7.	Fermentator temperature during production of alcohol from molasses is around __________ Â°C.
A.	5
B.	30
C.	150
D.	300
Answer» C. 150

Discussion

8.	Consider the production of ammonia from methene and air as raw materials. The catalyst used are: ( i ) __________ for steam reforming of methane and ( ii ) __________ for ammonia synthesis.
A.	i - Ni/Al 2 O 3 ; ii - Cu - ZnO/Al 2 O 3
B.	i - Fe/Al 2 O 3 ; ii - Cu - ZnO/Al 2 O 3
C.	i - Ni/Al 2 O 3 ; ii - Fe/Al 2 O 3
D.	i - Fe/Al 2 O 3 ; ii - Ni/Al 2 O 3
Answer» D. i - Fe/Al 2 O 3 ; ii - Ni/Al 2 O 3

Discussion

9.	Presence of H 2 S in raw water (to be chlorinated) results in the
A.	reduced softening capacity of zeolite.
B.	increased dosage of chlorine to provide a disinfecting residual in the water.
C.	easy removal of its hardness.
D.	none of these.
Answer» C. easy removal of its hardness.

Discussion

10.	Hydrazine (N 2 H 4 ) is used mainly as a/an
A.	explosive
B.	rocket fuel
C.	detergents additive
D.	none of these
Answer» C. detergents additive

Discussion

11.	Na 2 CO 3 is called
A.	washing soda
B.	soda ash
C.	plaster of paris
D.	calcite
Answer» C. plaster of paris

Discussion

12.	CO & H 2 are the constituents of
A.	producer gas
B.	water gas
C.	coke oven gas
D.	all (a), (b) and (c)
Answer» E.

Discussion

13.	Na 2 CO 3 .10H 2 O is called
A.	washing soda
B.	soda ash
C.	slaked lime
D.	quicklime
Answer» B. soda ash

Discussion

14.	Temperature during hydrogenation of oil should not be more than 200Â°C, otherwise it will result in
A.	pyrolysis of oil.
B.	sintering of porous catalyst.
C.	hydrogen embrittlement.
D.	all (a), (b) and (c).
Answer» E.

Discussion

15.	Conversion of SO 2 to SO 3 in Monsanto 4-pass converter is about __________ percent.
A.	80
B.	90
C.	98
D.	100
Answer» D. 100

Discussion

16.	Dry ice (solidified CO 2 ) is used for the
A.	storage & shipment of frozen foods and ice-creams.
B.	liquefaction of permanent gases.
C.	liquefaction of natural gas.
D.	none of these.
Answer» B. liquefaction of permanent gases.

Discussion

17.	Synthesis gas' meant for the synthesis of organic compound is a variable mixture of
A.	N 2 & H 2
B.	CO 2 & H 2
C.	CO & H 2
D.	C & H 2
Answer» D. C & H 2

Discussion

18.	Flash point of most vegetable oils is about __________ Â°C.
A.	50
B.	100
C.	200
D.	300
Answer» D. 300

Discussion

19.	During the manufacture of sulphuric acid, the temperature of molten sulphur is not increased beyond 160Â°C, as
A.	it is very corrosive at elevated temperature.
B.	its viscosity is not reduced on further heating (hence pressure drop on pumping it, cannot be further reduced).
C.	it decomposes on further increasing the temperature.
D.	none of these.
Answer» C. it decomposes on further increasing the temperature.

Discussion

20.	Ca(OH) 2 is called
A.	quicklime
B.	slaked lime
C.	limestone
D.	gypsum
Answer» C. limestone

Discussion

21.	The purpose of adding Na 2 CO 3 to water of low alkalinity is to
A.	permit the use of alum as a coagulant.
B.	increase the softening capacity of zeolite.
C.	facilitate easy regeneration of zeolite.
D.	all (a), (b) and (c).
Answer» B. increase the softening capacity of zeolite.

Discussion

22.	Which is the most efficient absorbant for SO 3 out of the following ?
A.	20% oleum
B.	65% oleum
C.	78%H 2 SO 4
D.	98%H 2 SO 4
Answer» E.

Discussion

23.	Carbon tetrachloride (CCl 4 ) is the starting raw material for the manufacture of
A.	trichloroethylene
B.	perchloroethylene
C.	parathion
D.	methanol
Answer» C. parathion

Discussion

24.	CaSO 4 . H 2 O is known as
A.	blue vitriol
B.	plaster of Paris
C.	gypsum
D.	zeolite
Answer» C. gypsum

Discussion

25.	Sulphuric acid saturated with SO 3 is called
A.	concentrated H 2 SO 4 .
B.	sulphurous acid.
C.	oleum.
D.	none of these.
Answer» D. none of these.

Discussion

26.	Purity of oxygen used for blowing in steel making L.D. converter is 99.5%. The boiling point of oxygen is about __________ Â°C.
A.	-53
B.	-103
C.	-183
D.	-196
Answer» D. -196

Discussion

27.	Oxygen is separated by distillation from air after its liquefaction. The boiling point of oxygen is about __________ Â°C.
A.	-83
B.	-183
C.	-196
D.	-218
Answer» C. -196

Discussion

28.	Mercury electrolytic cell produces 50-70% NaOH solution. Its operating temperature is __________ Â°C.
A.	25
B.	60-70
C.	150-200
D.	250-300
Answer» C. 150-200

Discussion

29.	High temperature carbonisation of coal takes place at __________ Â°C.
A.	2000
B.	700
C.	1100
D.	< 500
Answer» D. < 500

Discussion

30.	Sand and __________ is fused at 1300Â°C, to produce sodium silicate.
A.	limestone
B.	soda ash
C.	coke
D.	sodium sulphate
Answer» C. coke

Discussion

31.	Exothermic condensation reaction of monochlorobenzene with chloral in presence of 20% oleum as catalyst produces DDT. The reaction temperature is maintained at __________ Â°C.
A.	15-30
B.	90-100
C.	250-300
D.	<0
Answer» B. 90-100

Discussion

32.	Which of the following contains least amount of N 2 ?
A.	Coke oven gas
B.	Blast furnace gas
C.	Producer gas
D.	Water gas (blue gas).
Answer» B. Blast furnace gas

Discussion

33.	Vinyl chloride (CH 2 = CH.Cl) is produced by the thermal pyrolysis of ethylene dichloride at a pressure & temperature of
A.	4 kgf/cm 2 & 500Â°C.
B.	10 kgf/cm 2 & 1000Â°C.
C.	40 kg/cm 2 & 200Â°C.
D.	100 kgi/cm 2 & 500Â°C.
Answer» B. 10 kgf/cm 2 & 1000Â°C.

Discussion

34.	The temperature in the calcium carbide furnace is __________ Â°C.
A.	200-300
B.	700-850
C.	2000-2200
D.	4000-4500
Answer» D. 4000-4500

Discussion

35.	Argon is the third largest constituent of air (followed by N 2 & O 2 ). Its percentage by volume in air is
A.	0.14
B.	0.34
C.	0.94
D.	1.4
Answer» D. 1.4

Discussion

36.	In multistage equilibrium conversion of SO 2 to SO 3 (2SO 2 + O 2 2SO 3 ), the reverse reaction becomes appreciable at a temperature of 550Â° C. The percentage equilibrium conversion of SO 2 to SO 3 can be increased by
A.	increasing the oxygen concentration.
B.	putting more quantity of V 2 O 5 catalyst in the converter.
C.	removing some quantity of SO 3 during intermediate stage.
D.	maintaining low temperature & pressure in the converter.
Answer» D. maintaining low temperature & pressure in the converter.

Discussion

37.	Commercial scale production of hydrogen from iron-steam reaction represented by, 3Fe + 3H 2 O = Fe 3 O4 + 4H 2 , is not practised, as it is
A.	a slow reaction.
B.	a discontinuous reaction (requiring regeneration of iron by water gas intermittently).
C.	still in development stage (by employing fluidised bed technique).
D.	all (a), (b) and (c).
Answer» E.

Discussion

38.	Very dilute solutions are generally used in fermentation reactions for which the optimum temperature range is __________ Â°C.
A.	-5 to 0
B.	5 to 10
C.	30 to 50
D.	75 to 80
Answer» D. 75 to 80

Discussion

39.	Hollander beater' machine used in the paper manufacturing plant does not accomplish the task of
A.	final rolling out of paper.
B.	cutting of fibres.
C.	hydration of fibres.
D.	fibrillation of fibre.
Answer» B. cutting of fibres.

Discussion

40.	SO 2 is bubbled through hot sugar cane juice to
A.	act as an acidifying agent.
B.	increase its concentration.
C.	increase the amount of molasses.
D.	increase the crystal size.
Answer» B. increase its concentration.

Discussion

41.	At a given temperature, the equilibrium yield of SO 3 obtained from the oxidation of SO 2 is proportional to (where, P = pressure of the system )
A.	P
B.	P
C.	P 2
D.	1/ P
Answer» D. 1/ P

Discussion

42.	In the manufacture of H 2 SO 4 , vanadium catalyst as compared to platinum catalyst
A.	gives higher conversion efficiency.
B.	has a longer life and is not poisoned by arsenic.
C.	handles lower SO 2 content gas (7 -10% SO 2 ), thus increasing the capital cost of the plant.
D.	all (a), (b) and (c).
Answer» E.

Discussion

43.	Polymerisation product of C 2 F 4 (carbon tetraflouride) is called P.T.F.E (poly chloro tetra flouro ethylene). It is also called
A.	polyurethane
B.	silicone
C.	teflon
D.	epoxy resin
Answer» D. epoxy resin

Discussion

44.	Conversion of CO to CO 2 by steam in presence of a catalyst is called
A.	steam reforming.
B.	shift conversion.
C.	steam gasification.
D.	none of these.
Answer» C. steam gasification.

Discussion

45.	Which of the following processes does not produce Cl 2 as a co-product during the manufacture of caustic soda ?
A.	Diaphragm electrolytic cell process
B.	Mercury electrolytic cell process
C.	Lime-soda process
D.	None of these
Answer» D. None of these

Discussion

46.	Absorption of SO 3 in 97% H 2 SO 4 is
A.	exothermic
B.	endothermic
C.	not possible
D.	none of these
Answer» B. endothermic

Discussion

47.	Heating of __________ to 120Â°C, produces plaster of paris.
A.	blue vitriol
B.	gypsum
C.	calcium silicate
D.	calcium sulphate
Answer» C. calcium silicate

Discussion

48.	Fermentation of molasses to produce ethyl alcohol is done at __________ Â°C
A.	20 - 30
B.	< - 5
C.	100 - 150
D.	250 - 300
Answer» B. < - 5

Discussion

49.	The combustion reaction, C + O 2 = CO 2 , is
A.	exothermic
B.	endothermic
C.	autocatalytic
D.	none of these
Answer» B. endothermic

Discussion

50.	The gasification reaction represented by, C + H 2 O = CO + H 2 , is a/an __________ reaction.
A.	exothermic
B.	endothermic
C.	catalytic
D.	autocatalytic
Answer» C. catalytic

Discussion

Explore topic-wise MCQs in Chemical Engineering.

The compressive strength of cement should not be less than about 110Kg/cm 2 after three days & not less than 170Kg/cm 2 after seven days. The fineness of an ordinary cement as determined by turbidimetric method should be about __________ cm 2 /gm.

Low temperature carbonisation of coal takes place at __________ Â°C.

In contact process, SO 3 is absorbed in 97% H 2 SO 4 and not in water, because

In an integrated steel plant, NH 3 present in coke oven gas is normally recovered as

Alum [Al 2 (SO 4 ) 3 ] is used as a coagulant in water treatment to remove

90% of the caprolactum is converted to nylon-6 on its condensation polymerisation in the reactor maintained at __________ Â°C.

Fermentator temperature during production of alcohol from molasses is around __________ Â°C.

Consider the production of ammonia from methene and air as raw materials. The catalyst used are: ( i ) __________ for steam reforming of methane and ( ii ) __________ for ammonia synthesis.

Presence of H 2 S in raw water (to be chlorinated) results in the

Hydrazine (N 2 H 4 ) is used mainly as a/an

Na 2 CO 3 is called

CO & H 2 are the constituents of

Na 2 CO 3 .10H 2 O is called

Temperature during hydrogenation of oil should not be more than 200Â°C, otherwise it will result in

Conversion of SO 2 to SO 3 in Monsanto 4-pass converter is about __________ percent.

Dry ice (solidified CO 2 ) is used for the

Synthesis gas' meant for the synthesis of organic compound is a variable mixture of

Flash point of most vegetable oils is about __________ Â°C.

During the manufacture of sulphuric acid, the temperature of molten sulphur is not increased beyond 160Â°C, as

Ca(OH) 2 is called

The purpose of adding Na 2 CO 3 to water of low alkalinity is to

Which is the most efficient absorbant for SO 3 out of the following ?

Carbon tetrachloride (CCl 4 ) is the starting raw material for the manufacture of

CaSO 4 . H 2 O is known as

Sulphuric acid saturated with SO 3 is called

Purity of oxygen used for blowing in steel making L.D. converter is 99.5%. The boiling point of oxygen is about __________ Â°C.

Oxygen is separated by distillation from air after its liquefaction. The boiling point of oxygen is about __________ Â°C.

Mercury electrolytic cell produces 50-70% NaOH solution. Its operating temperature is __________ Â°C.

High temperature carbonisation of coal takes place at __________ Â°C.

Sand and __________ is fused at 1300Â°C, to produce sodium silicate.

Exothermic condensation reaction of monochlorobenzene with chloral in presence of 20% oleum as catalyst produces DDT. The reaction temperature is maintained at __________ Â°C.

Which of the following contains least amount of N 2 ?

Vinyl chloride (CH 2 = CH.Cl) is produced by the thermal pyrolysis of ethylene dichloride at a pressure & temperature of

The temperature in the calcium carbide furnace is __________ Â°C.

Argon is the third largest constituent of air (followed by N 2 & O 2 ). Its percentage by volume in air is

In multistage equilibrium conversion of SO 2 to SO 3 (2SO 2 + O 2 2SO 3 ), the reverse reaction becomes appreciable at a temperature of 550Â° C. The percentage equilibrium conversion of SO 2 to SO 3 can be increased by

Commercial scale production of hydrogen from iron-steam reaction represented by, 3Fe + 3H 2 O = Fe 3 O4 + 4H 2 , is not practised, as it is

Very dilute solutions are generally used in fermentation reactions for which the optimum temperature range is __________ Â°C.

Hollander beater' machine used in the paper manufacturing plant does not accomplish the task of

SO 2 is bubbled through hot sugar cane juice to

At a given temperature, the equilibrium yield of SO 3 obtained from the oxidation of SO 2 is proportional to (where, P = pressure of the system )

In the manufacture of H 2 SO 4 , vanadium catalyst as compared to platinum catalyst

Polymerisation product of C 2 F 4 (carbon tetraflouride) is called P.T.F.E (poly chloro tetra flouro ethylene). It is also called

Conversion of CO to CO 2 by steam in presence of a catalyst is called

Which of the following processes does not produce Cl 2 as a co-product during the manufacture of caustic soda ?

Absorption of SO 3 in 97% H 2 SO 4 is

Heating of __________ to 120Â°C, produces plaster of paris.

Fermentation of molasses to produce ethyl alcohol is done at __________ Â°C

The combustion reaction, C + O 2 = CO 2 , is

The gasification reaction represented by, C + H 2 O = CO + H 2 , is a/an __________ reaction.

Consider the production of ammonia from methene and air as raw materials. The catalyst used are: ( i ) for steam reforming of methane and ( ii ) for ammonia synthesis.