8247 + Mcqs in Chemical Engineering Page 109 McqOptions

5401.	The vapor pressures of benzene and toluene are 3 and 4/3 atmospheres respectively. A liquid feed of 0.4 moles of benzene and 0.6 moles of toluene is vapourised. Assuming that the products are in equilibrium, the vapor phase mole fraction of benzene is
A.	0.4
B.	0.6
C.	0.8
D.	0.2
Answer» C. 0.8

Discussion

5402.	__________ kg of CaC03 on heating will give 56 kg of CaO.
A.	56 .
B.	100
C.	144
D.	1000
Answer» C. 144

Discussion

5403.	Enthalpy of formation of NH3 is - 46 kJ/kg mole. The enthalpy change for the gaseous reaction, 2NH3 N2 + 3H2, is equal to __________ kJ/kg. mole.
A.	46
B.	92
C.	-23
D.	-92
Answer» C. -23

Discussion

5404.	At a constant volume, for a fixed number of moles of a gas, the pressure of the gas increases with rise of temperature due to
A.	decrease in mean free path.
B.	increased collision rate among molecules.
C.	increase in molecular attraction.
D.	increase in average molecular speed.
Answer» D. increase in average molecular speed.

Discussion

5405.	Total energy at a point comprises of __________ energy.
A.	potential & kinetic
B.	pressure
C.	internal
D.	all (a), (b) & (c).
Answer» E.

Discussion

5406.	'Cox' chart which is useful in the design of a distillation column (particularly suitable for petroleum hydrocarbons) is a plot of the
A.	temperature vs. log (vapor pressure).
B.	vapor pressure vs. log (temperature).
C.	log (temperature) vs. log (vapor pressure).
D.	vapor pressure vs. temperature.
Answer» B. vapor pressure vs. log (temperature).

Discussion

5407.	Boiling point of a non-homogeneous mixture of immiscible liquids is __________ that of any one of its separate components.
A.	lower than
B.	higher than
C.	equal to
D.	either (a) or (b); depends on the liquids
Answer» B. higher than

Discussion

5408.	A vapor whose partial pressure is less than its equilibrium vapor pressure is called a __________ vapor.
A.	saturated
B.	supersaturated
C.	superheated
D.	none of these
Answer» D. none of these

Discussion

5409.	Sometimes, in chemical processes, a part of the outlet stream is rejected as waste in order to keep the impurity level in the system within limits. This phenomenon is termed as the
A.	recycling
B.	purging
C.	bypassing
D.	recirculation
Answer» C. bypassing

Discussion

5410.	The density of a gas at N.T.P.is ' '. Keeping the pressure constant (i.e. 760 mm Hg), the 3 density of the gas will become at a temperature of __________ K
A.	273
B.	300
C.	400
D.	300
Answer» D. 300

Discussion

5411.	A gas occupies a volume of 283 c.c at 10 C. If it is heated to 20 C at constant pressure, the new volume of the gas will be __________ c.c.
A.	283
B.	566
C.	293
D.	141.5
Answer» D. 141.5

Discussion

5412.	Cp/Cv for monoatomic gases is
A.	1.44
B.	1.66
C.	1.99
D.	1
Answer» C. 1.99

Discussion

5413.	One of the specific gravity scales is "Brix" (used speicifically for sugar solution). It is defined as
A.	Brix = (400/G) - 400
B.	Brix = 200 (G-1)
C.	Brix = 145 - (145/G)
D.	none of these
Answer» B. Brix = 200 (G-1)

Discussion

5414.	Which of the following is not a unit of pressure?
A.	Parsec
B.	Kilo-pascal
C.	Bar
D.	Newton/metre
E.	<sup>2</sup>
Answer» B. Kilo-pascal

Discussion

5415.	Acidity or alkanity of a solution is expressed by its pH value, which is defined as (where, [H+] = hydrogen ion concentration in the solution).
A.	<img src="/_files/images/chemical-engineering/stoichiometry/88-308-1.png">
B.	<img src="/_files/images/chemical-engineering/stoichiometry/88-308-2.png">
C.	<img src="/_files/images/chemical-engineering/stoichiometry/88-308-3.png">
D.	none of these
Answer» B. <img src="/_files/images/chemical-engineering/stoichiometry/88-308-2.png">

Discussion

5416.	For water evaporating into usaturated air under adiabatic conditions and at constant pressure, the __________ remains constant throughout the period of vaporisation.
A.	dry bulb temperature
B.	wet bulb temperature
C.	humidity
D.	relative saturation
Answer» C. humidity

Discussion

5417.	The reverse process of fractional crystallisation is called
A.	stripping
B.	leaching
C.	differential distillation
D.	absorption
Answer» C. differential distillation

Discussion

5418.	Enthalpy change resulting, when unit mass of solid is wetted with sufficient liquid, so that further addition of liquid produces no additional thermal effect, is called the heat of
A.	mixing
B.	adsorption
C.	wetting
D.	complete wetting
Answer» E.

Discussion

5419.	At a temperature of 0 K, the molecules of a gas have only __________ energy.
A.	rotational
B.	vibrational
C.	translational
D.	none of these
Answer» D. none of these

Discussion

5420.	A butane isomerisation process produces 70 kmole/hr of pure isobutane. A purge stream removed continuously, contains 85% n-butane and 15% impurity (mole%). The feed stream is n-butane containing 1% impurity (mole%). The flow rate of the purge stream will be
A.	3 kmole/hr
B.	4 kmole/hr
C.	5 kmole/hr
D.	6 kmole/hr
Answer» D. 6 kmole/hr

Discussion

5421.	"The equilibrium value of the mole fraction of the gas dissolved in a liquid is directly proportional to the partial pressure of that gas above the liquid surface". This statement pertaining to the solubility of gases in liquid is the __________ law.
A.	Raoult's
B.	Henry's
C.	Amgat's
D.	none of these
Answer» C. Amgat's

Discussion

5422.	Which of the following is not a unit of length ?
A.	Parsec
B.	Angstrom
C.	Barn
D.	Fermi
Answer» D. Fermi

Discussion

5423.	80 kg of Na2SO4 (molecular weight = 142) is present in 330 kg of an aqueous solution. The solution is cooled such that. 80 kg of Na2SO4 .10H2O crystals separate out. The weight fraction of Na2SO4 in the remaining solution is
A.	0.00
B.	0.18
C.	0.24
D.	1.00
Answer» C. 0.24

Discussion

5424.	Elements in a periodic table are arranged in order of their
A.	atomic number.
B.	mass number.
C.	atomic weight.
D.	metallic characteristics.
Answer» B. mass number.

Discussion

5425.	If 1.5 moles of oxygen combines with aluminium to form Al2O3, then the weight of aluminium (atomic weight = 27 ) used in this reaction is __________ gm.
A.	27
B.	54
C.	5.4
D.	2.7
Answer» C. 5.4

Discussion

5426.	The unit of dynamic viscosity is
A.	stoke
B.	poise
C.	gm/cm sec.
D.	both (b) & (c)
Answer» E.

Discussion

5427.	No cooling occurs, when an ideal gas undergoes unrestrained expansion, because the molecules
A.	collide without loss of energy.
B.	do work equal to loss in kinetic energy.
C.	are above the inversion temperature.
D.	exert no attractive force on each other.
Answer» D. exert no attractive force on each other.

Discussion

5428.	With increase in the solute concentration, the specific heat of aqueous solutions
A.	increases
B.	decreases
C.	remains unchanged
D.	either (a) or (b); depends on the type of solution
Answer» C. remains unchanged

Discussion

5429.	The heat capacity of a substance is
A.	greater for liquid state than for solid state.
B.	lower for liquid state than for gaseous state.
C.	higher for solid state than for liquid state.
D.	equal for solid and liquid states below melting point.
Answer» B. lower for liquid state than for gaseous state.

Discussion

5430.	The heat of solution depends upon the
A.	nature of solvent
B.	concentration of solution
C.	nature of solute
D.	all (a), (b) & (c)
Answer» E.

Discussion

5431.	The molar composition of a gas is 10% H2, 10% O2, 30% CO2 and balance H2O. If 50% H2O condenses, the final mole percent of H2 in the gas on a dry basis will be
A.	10%
B.	5%
C.	18.18%
D.	20%
Answer» E.

Discussion

5432.	1 bar is almost equal to __________ atmosphere.
A.	1
B.	10
C.	100
D.	1000
Answer» B. 10

Discussion

5433.	Kopp's rule is useful for the determination of
A.	molal heat capacities of gases.
B.	heat capacities of solids.
C.	activation energy.
D.	heat capacities of gases.
Answer» C. activation energy.

Discussion

5434.	Viscosity of 1 centipoise is equal to 1 centis-toke in case of
A.	water
B.	mercury
C.	carbon tetrachloride
D.	none of these
Answer» B. mercury

Discussion

5435.	A vessel of volume 1000 m3 contains air which is saturated with water vapour. The total pressure and temperature are 100 kPa and 20 C respectively. Assuming that the vapour pressure of water at 20 C is 2.34 kPa, the amount of water vapour (in kg) in the vessel is approximately
A.	17
B.	20
C.	25
D.	34
Answer» B. 20

Discussion

5436.	Othmer chart is useful in estimating the heat of
A.	mixing
B.	wetting
C.	adsorption
D.	none of these
Answer» D. none of these

Discussion

5437.	The vapor pressure of water at 100 C is
A.	100N/m
B.	<sup>2</sup>
C.	76 cms of Hg
D.	13.6 cms of Hg
E.	760 mm wc
Answer» C. 76 cms of Hg

Discussion

5438.	Unit of power is
A.	joule
B.	watt
C.	joule/Second
D.	both(b)&(c)
Answer» E.

Discussion

5439.	The vapour pressure of a solution (made by dissolving a solute in a solvent) is __________ that of the pure solvent.
A.	less than
B.	more than
C.	equal to
D.	either more or less; depends on the solvent
Answer» B. more than

Discussion

5440.	The amount of Zn (atomic weight = 65) required to form 224 c.c. of H2 at N.T.P. on treatment with dilute H2SO4 will be __________ gm.
A.	0.065
B.	0.65
C.	6.5
D.	65
Answer» C. 6.5

Discussion

5441.	Pick out the wrong statement about the recycle stream in a process.
A.	Recycling in a process stream helps in utilising the valuable reactants to the maximum with minimum loss of reactants.
B.	The ratio of the quantity of a reactant present in the reactor feed of a recycling operation to the quantity of the same reactant entering the process as fresh feed is called combined feed ratio.
C.	Recycling in a process does not help in getting higher extent of reaction.
D.	Recycling is exemplified by refluxing back a part of the distillate to the distillation column to maintain the quantity of liquid within the column.
Answer» D. Recycling is exemplified by refluxing back a part of the distillate to the distillation column to maintain the quantity of liquid within the column.

Discussion

5442.	Internal energy is independent of the __________ for an ideal gas.
A.	pressure
B.	volume
C.	both (a) & (b)
D.	neither (a) nor (b)
Answer» D. neither (a) nor (b)

Discussion

5443.	__________ fuels require the maximum percentage of 'excess air' for complete combustion.
A.	Solid
B.	Liquid
C.	Gaseous
D.	Nuclear
Answer» B. Liquid

Discussion

5444.	__________ equation relates latent heat and boiling point.
A.	Antonie
B.	Kistyakowsky
C.	Kopp's
D.	Trouton's
Answer» E.

Discussion

5445.	At higher temperature, molal heat capacities of most of the gases (at constant pressure) __________ with increase in temperature.
A.	increases
B.	decreases
C.	remains unchanged
D.	increases linearly
Answer» B. decreases

Discussion

5446.	Applicability of Claussius-Clapeyron equation is subject to the condition that the
A.	vapor follows ideal gas law.
B.	volume in the liquid state is negligible.
C.	both (a) & (b)
D.	neither (a) nor (b)
Answer» D. neither (a) nor (b)

Discussion

5447.	Dry air is a mixture of
A.	vapors
B.	gases
C.	both (a) & (b)
D.	neither (a) nor (b)
Answer» C. both (a) & (b)

Discussion

5448.	pH value of H2SO4 (5% concentration) is
A.	5
B.	7
C.	> 7
D.	< 7
Answer» E.

Discussion

5449.	A 'limiting reactant' is the one, which decides the __________ in the chemical reacation.
A.	equilibrium constant
B.	conversion
C.	rate constant
D.	none of these
Answer» C. rate constant

Discussion

5450.	If the absolute temperature of an ideal gas is tripled and simultaneously the pressure is reduced to one third; then the volume of gas will
A.	remain unaltered
B.	increase nine fold
C.	increase three fold
D.	decrease three fold
Answer» C. increase three fold

Discussion

Explore topic-wise MCQs in Engineering.

The vapor pressures of benzene and toluene are 3 and 4/3 atmospheres respectively. A liquid feed of 0.4 moles of benzene and 0.6 moles of toluene is vapourised. Assuming that the products are in equilibrium, the vapor phase mole fraction of benzene is

__________ kg of CaC03 on heating will give 56 kg of CaO.

Enthalpy of formation of NH3 is - 46 kJ/kg mole. The enthalpy change for the gaseous reaction, 2NH3 N2 + 3H2, is equal to __________ kJ/kg. mole.

At a constant volume, for a fixed number of moles of a gas, the pressure of the gas increases with rise of temperature due to

Total energy at a point comprises of __________ energy.

'Cox' chart which is useful in the design of a distillation column (particularly suitable for petroleum hydrocarbons) is a plot of the

Boiling point of a non-homogeneous mixture of immiscible liquids is __________ that of any one of its separate components.

A vapor whose partial pressure is less than its equilibrium vapor pressure is called a __________ vapor.

Sometimes, in chemical processes, a part of the outlet stream is rejected as waste in order to keep the impurity level in the system within limits. This phenomenon is termed as the

The density of a gas at N.T.P.is ' '. Keeping the pressure constant (i.e. 760 mm Hg), the 3 density of the gas will become at a temperature of __________ K

A gas occupies a volume of 283 c.c at 10 C. If it is heated to 20 C at constant pressure, the new volume of the gas will be __________ c.c.

Cp/Cv for monoatomic gases is

One of the specific gravity scales is "Brix" (used speicifically for sugar solution). It is defined as

Which of the following is not a unit of pressure?

Acidity or alkanity of a solution is expressed by its pH value, which is defined as (where, [H+] = hydrogen ion concentration in the solution).

For water evaporating into usaturated air under adiabatic conditions and at constant pressure, the __________ remains constant throughout the period of vaporisation.

The reverse process of fractional crystallisation is called

Enthalpy change resulting, when unit mass of solid is wetted with sufficient liquid, so that further addition of liquid produces no additional thermal effect, is called the heat of

At a temperature of 0 K, the molecules of a gas have only __________ energy.

A butane isomerisation process produces 70 kmole/hr of pure isobutane. A purge stream removed continuously, contains 85% n-butane and 15% impurity (mole%). The feed stream is n-butane containing 1% impurity (mole%). The flow rate of the purge stream will be

"The equilibrium value of the mole fraction of the gas dissolved in a liquid is directly proportional to the partial pressure of that gas above the liquid surface". This statement pertaining to the solubility of gases in liquid is the __________ law.

Which of the following is not a unit of length ?

80 kg of Na2SO4 (molecular weight = 142) is present in 330 kg of an aqueous solution. The solution is cooled such that. 80 kg of Na2SO4 .10H2O crystals separate out. The weight fraction of Na2SO4 in the remaining solution is

Elements in a periodic table are arranged in order of their

If 1.5 moles of oxygen combines with aluminium to form Al2O3, then the weight of aluminium (atomic weight = 27 ) used in this reaction is __________ gm.

The unit of dynamic viscosity is

No cooling occurs, when an ideal gas undergoes unrestrained expansion, because the molecules

With increase in the solute concentration, the specific heat of aqueous solutions

The heat capacity of a substance is

The heat of solution depends upon the

The molar composition of a gas is 10% H2, 10% O2, 30% CO2 and balance H2O. If 50% H2O condenses, the final mole percent of H2 in the gas on a dry basis will be

1 bar is almost equal to __________ atmosphere.

Kopp's rule is useful for the determination of

Viscosity of 1 centipoise is equal to 1 centis-toke in case of

A vessel of volume 1000 m3 contains air which is saturated with water vapour. The total pressure and temperature are 100 kPa and 20 C respectively. Assuming that the vapour pressure of water at 20 C is 2.34 kPa, the amount of water vapour (in kg) in the vessel is approximately

Othmer chart is useful in estimating the heat of

The vapor pressure of water at 100 C is

Unit of power is

The vapour pressure of a solution (made by dissolving a solute in a solvent) is __________ that of the pure solvent.

The amount of Zn (atomic weight = 65) required to form 224 c.c. of H2 at N.T.P. on treatment with dilute H2SO4 will be __________ gm.

Pick out the wrong statement about the recycle stream in a process.

Internal energy is independent of the __________ for an ideal gas.

__________ fuels require the maximum percentage of 'excess air' for complete combustion.

__________ equation relates latent heat and boiling point.

At higher temperature, molal heat capacities of most of the gases (at constant pressure) __________ with increase in temperature.

Applicability of Claussius-Clapeyron equation is subject to the condition that the

Dry air is a mixture of

pH value of H2SO4 (5% concentration) is

A 'limiting reactant' is the one, which decides the __________ in the chemical reacation.

If the absolute temperature of an ideal gas is tripled and simultaneously the pressure is reduced to one third; then the volume of gas will