Capacity of a refractory brick to withstand-sudden changes in temperature is denoted by the property called_________________?

Refractoriness under load (RUL)

Boiling point of a solution as compared to that of the corresponding solvent is _________________?

Either more or less; depends upon the solvent

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

Either A. or B.; depends on the liquids

Avogadro’s number is equal to__________________?

6.023 × 1016 molecules/kg.mole

6.023 × 1023 molecules/kg.mole

6.023 × 1023 molecules/gm.mole

6.023 × 1016 molecules/kg.mole

6.023 × 1026 molecules/gm.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___________________?

Increase in average molecular speed

Increased collision rate among molecules

Increase in molecular attraction

Increase in average molecular speed

At 100°C, water and methylcyclohexane both have vapour pressures of 1 atm. Also at 100°C, the latent heats of vaporisation of these compounds are 40.63 kJ/mole for water and 31.55 kJ/mole for methylcyclohexane. The vapour pressure of water at 150°C is 4.69 atm. At 150°C, the vapour pressure of methylcyclohexane would be expected to be_________________?

Indeterminate due to lack of data

Significantly less than 4.69 atm

Significantly more than 4.69 atm

Indeterminate due to lack of data

Assume that benzene is insoluble in water. The normal boiling points of benzene and water are 80.1 and 100°C respectively. At a pressure of 1 atm, the boiling point of a mixture of benzene and water is__________________?

Greater than 80.1°C but less than 100°C

Applicability of Clausius-Clapeyron Equation is subject to the condition that the __________________?

Volume in the liquid state is negligible

An ideal gas can be liquefied, because ___________________?

It gets solidified directly without becoming liquid

Its molecular size is very small

Its critical temperature is more than 0°C

Forces operative between its molecules are negligible

It gets solidified directly without becoming liquid

An Azeotropic solution of two liquids has boiling point lower than either of them, when it_____________?

Shows negative deviation from Raoult’s law

Shows positive deviation from Raoult’s law

According to Raoult’s law, “The vapor pressure exerted by component in a solution is proportional to the mole fraction of that component.” Raoult’s law is not applicable under the following assumption/condition?

The attractive forces between like and unlike molecules are almost equal

No component is concentrated at the surface of the solution

The component molecules are non polar and are of almost equal size

In the formation of solution, chemical combination/molecular association between unlike molecules takes place

The attractive forces between like and unlike molecules are almost equal

332 + Mcqs in Stoichiometry for Chemical in Chemical Engineering Page 6 McqOptions

251.	Chemically, mullite refractories is________________?
A.	3Al2O3.2SiO2
B.	Al2O3
C.	ZrSO4
D.	ThO2
Answer» B. Al2O3

Discussion

252.	_________________ chart is a graph related to Antoine equation ?
A.	Ostwald
B.	Cox
C.	Mollier’s
D.	Enthalpy-concentration
Answer» C. Mollier’s

Discussion

253.	Ceramic recuperators used for waste heat recovery from high temperature flue gas going out of the furnace is made of ________________?
A.	Fireclay
B.	Silicon carbide
C.	Corundum
D.	Siliceous fireclay
Answer» C. Corundum

Discussion

254.	Capacity of a refractory brick to withstand-sudden changes in temperature is denoted by the property called_________________?
A.	Spalling resistance
B.	Refractoriness
C.	Refractoriness under load (RUL)
D.	None of these
Answer» B. Refractoriness

Discussion

255.	Boiling point of a solution as compared to that of the corresponding solvent is _________________?
A.	Less
B.	Less
C.	Same
D.	Either more or less; depends upon the solvent
Answer» C. Same

Discussion

256.	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

257.	Beryllia (which is used in making crucibles for melting uranium & thorium) is superior to alumina in all respects for high temperature (> 1900°C ) use, except______________?
A.	Cost
B.	Electrical conductivity
C.	Thermal conductivity
D.	Fusion point
Answer» B. Electrical conductivity

Discussion

258.	Avogadro’s number is equal to__________________?
A.	6.023 × 1023 molecules/kg.mole
B.	6.023 × 1023 molecules/gm.mole
C.	6.023 × 1016 molecules/kg.mole
D.	6.023 × 1026 molecules/gm.mole
Answer» C. 6.023 × 1016 molecules/kg.mole

Discussion

259.	Avogadro number is the number of molecules in one ____________ of a gas?
A.	gram
B.	Kilogram
C.	gm.mole
D.	Litre
Answer» D. Litre

Discussion

260.	Average molecular weight of air is about ____________________?
A.	21
B.	29
C.	23
D.	79
Answer» C. 23

Discussion

261.	Atoms of the same element, but of different masses are called__________________?
A.	Isobars
B.	Isotones
C.	Isotopes
D.	None of these
Answer» D. None of these

Discussion

262.	Atomic ______________ of an element is a whole number?
A.	Weight
B.	Number
C.	Volume
D.	Radius
Answer» C. Volume

Discussion

263.	Atmospheric pressure corresponds to a hydrostatic head of_________________?
A.	13.6 cms of Hg
B.	34 ft ofH2O
C.	1 metre of H2O
D.	13.6 metres of Hg
Answer» C. 1 metre of H2O

Discussion

264.	At standard conditions, N2 + 2O2 ⇌ 2NO2; ΔG° = 100 kJ/mole NO + ½O2 ⇌ 2NO2; ΔG° = -35 kJ/mole The standard free energy of formation of NO in kJ/mole is___________________?
A.	15
B.	30
C.	85
D.	170
Answer» D. 170

Discussion

265.	At room temperature, the product [H+] [OH-] in a solution is 10-14 moles/litre. If, [OH-] = 10-6 moles/litre, then the pH of the solution will be ________________________?
A.	6
B.	8
C.	10
D.	12
Answer» C. 10

Discussion

266.	At higher temperatures, molal heat capacities for most of the gases (at constant pressure) _______________ with increase in temperature?
A.	Varies linearly
B.	Increases
C.	Decreases
D.	Does not vary
Answer» C. Decreases

Discussion

267.	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

268.	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

269.	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

270.	At 100°C, water and methylcyclohexane both have vapour pressures of 1 atm. Also at 100°C, the latent heats of vaporisation of these compounds are 40.63 kJ/mole for water and 31.55 kJ/mole for methylcyclohexane. The vapour pressure of water at 150°C is 4.69 atm. At 150°C, the vapour pressure of methylcyclohexane would be expected to be_________________?
A.	Significantly less than 4.69 atm
B.	Nearly equal to 4.69 atm
C.	Significantly more than 4.69 atm
D.	Indeterminate due to lack of data
Answer» D. Indeterminate due to lack of data

Discussion

271.	Assuming that CO2 obeys perfect gas law, calculate the density of CO2 (in kg/m3) at 263°C and 2 atm ?
A.	1
B.	2
C.	3
D.	4
Answer» C. 3

Discussion

272.	Assuming applicability of ideal gas law, the pure component volume of the vapor in a saturated gas can be calculated from theoretical relationship. The volumetric composition of a vapor saturated gas is independent of the___________________?
A.	Nature of the liquid
B.	Nature of the gas
C.	Temperature of the liquid
D.	Total pressure
Answer» C. Temperature of the liquid

Discussion

273.	Assume that benzene is insoluble in water. The normal boiling points of benzene and water are 80.1 and 100°C respectively. At a pressure of 1 atm, the boiling point of a mixture of benzene and water is__________________?
A.	80.1°C
B.	Less than 80.1°C
C.	100°C
D.	Greater than 80.1°C but less than 100°C
Answer» E.

Discussion

274.	As per Kirchhoff s equation, the heat of reaction is affected by the__________________?
A.	Pressure
B.	Volume
C.	Temperature
D.	Molecularity
Answer» D. Molecularity

Discussion

275.	Applicability of Clausius-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

276.	°API gravity of water at N.T.P. is about__________________?
A.	0
B.	1
C.	10
D.	100
Answer» D. 100

Discussion

277.	An ideal gas can be liquefied, because ___________________?
A.	Its molecular size is very small
B.	Its critical temperature is more than 0°C
C.	Forces operative between its molecules are negligible
D.	It gets solidified directly without becoming liquid
Answer» D. It gets solidified directly without becoming liquid

Discussion

278.	An equation for calculating vapour pressure is given by, log10 P = A – B(t + c). This is called the________________?
A.	Kistyakowsky equation
B.	Antoine equation
C.	Kopp’s rule
D.	Trouton’s rule
Answer» C. Kopp’s rule

Discussion

279.	An Azeotropic solution of two liquids has boiling point lower than either of them, when it_____________?
A.	Is saturated
B.	Is unsaturated
C.	Shows negative deviation from Raoult’s law
D.	Shows positive deviation from Raoult’s law
Answer» E.

Discussion

280.	An aqueous solution of 2.45% by weight H2SO4 has a specific gravity of 1.011. The composition expressed in normality is______________?
A.	0.2500
B.	0.2528
C.	0.5000
D.	0.5055
Answer» E.

Discussion

281.	Air at a temperature of 20°C and 750 mm Hg pressure has a relative humidity of 80%. What is its percentage humidity? Vapour pressure of water at 20°C is 17.5 mm Hg?
A.	80.38
B.	80
C.	79.62
D.	78.51
Answer» D. 78.51

Discussion

282.	Addition of zircon to silica refractory brick improves its_________________?
A.	Crushing strength
B.	Resistance to slag attack
C.	Both A. and B.
D.	Neither A. nor B.
Answer» C. Both A. and B.

Discussion

283.	Addition of a non-volatile solute to a solvent produces a ______________ in its solvent?
A.	Freezing point elevation
B.	Boiling point depression
C.	Vapor pressure lowering
D.	All A., B. & C.
Answer» D. All A., B. & C.

Discussion

284.	Addition of a non-volatile solute to a pure solvent ____________________?
A.	Increases its freezing point
B.	Increases its boiling point
C.	Decreases its freezing point
D.	Both B. and C.
Answer» E.

Discussion

285.	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.	log (1/H+)
B.	– log (1/H+)
C.	1/log H+
D.	None of these
Answer» B. – log (1/H+)

Discussion

286.	According to the kinetic theory, the thermal conductivity of a monatomic gas is proportional to___________________?
A.	T
B.	T0.5
C.	T1.5
D.	T2
Answer» C. T1.5

Discussion

287.	According to Raoult’s law, “The vapor pressure exerted by component in a solution is proportional to the mole fraction of that component.” Raoult’s law is not applicable under the following assumption/condition?
A.	No component is concentrated at the surface of the solution
B.	The component molecules are non polar and are of almost equal size
C.	In the formation of solution, chemical combination/molecular association between unlike molecules takes place
D.	The attractive forces between like and unlike molecules are almost equal
Answer» D. The attractive forces between like and unlike molecules are almost equal

Discussion

288.	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

289.	A very dilute solution is prepared by dissolving ‘x1’ mole of solute in ‘x2’ mole of a solvent. The mole fraction of solute is approximately equal to_________________?
A.	x1/x2
B.	x2/x1
C.	1 – (x1/x2)
D.	1/x2
Answer» B. x2/x1

Discussion

290.	A vapor whose partial pressure is less than its equilibrium vapor pressure is called the _____________ vapor?
A.	Saturated
B.	Superheated
C.	Unsaturated
D.	Dry gaseous
Answer» C. Unsaturated

Discussion

291.	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

292.	A vapor that exists above its critical temperature is termed as a _____________ vapor?
A.	Saturated
B.	Unsaturated
C.	Gaseous
D.	Sub-cooled
Answer» D. Sub-cooled

Discussion

293.	A sugar solution containing _________________ percent sugar is equivalent to 1 Brix?
A.	0.01
B.	0.1
C.	1
D.	10
Answer» D. 10

Discussion

294.	A solution with reasonably permanent pH is called a/an _______________ solution?
A.	Ideal
B.	Non-ideal
C.	Buffer
D.	Colloidal
Answer» D. Colloidal

Discussion

295.	A solution is made by dissolving 1 kilo mole of solute in 2000 kg of solvent. The molality of the solution is_________________?
A.	2
B.	1
C.	0.5
D.	0.05
Answer» D. 0.05

Discussion

296.	A solution having a pH value of 5 is less acidic than the one having a pH value of 2 by a factor of ________________?
A.	3
B.	100
C.	1000
D.	None of these
Answer» D. None of these

Discussion

297.	A saturated vapor on being compressed would___________________?
A.	Condense
B.	Form wet steam
C.	Both A. & B.
D.	Neither A. nor B.
Answer» D. Neither A. nor B.

Discussion

298.	A sample of well water contains 140 gm/m3 Ca2+ ions and 345 gm/m3 Na+ ions. The hardness of the sample of water, expressed in terms of equivalent CaCO3 in gm/m3 is (assuming atomic masses of Ca :40, Na : 23, C : 12, O : 16) ?
A.	350
B.	485
C.	140
D.	345
Answer» B. 485

Discussion

299.	A rigid vessel containing three moles of nitrogen gas at 30°C is heated to 250°C. Assume the average capacities of nitrogen to be Cp = 29.1 J/mole.°C and, Cv = 20.8 J/mole.°C. The heat required, neglecting the heat capacity of the vessel, is__________________?
A.	13728 J
B.	19206 J
C.	4576 J
D.	12712 J
Answer» C. 4576 J

Discussion

300.	A reduction process is accompanied with increase in the_______________?
A.	Number of electrons
B.	Oxidation number
C.	Both A. & B.
D.	Neither A. nor B.
Answer» B. Oxidation number

Discussion

Explore topic-wise MCQs in Chemical Engineering.

Chemically, mullite refractories is________________?

_________________ chart is a graph related to Antoine equation ?

Ceramic recuperators used for waste heat recovery from high temperature flue gas going out of the furnace is made of ________________?

Capacity of a refractory brick to withstand-sudden changes in temperature is denoted by the property called_________________?

Boiling point of a solution as compared to that of the corresponding solvent is _________________?

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

Beryllia (which is used in making crucibles for melting uranium & thorium) is superior to alumina in all respects for high temperature (> 1900°C ) use, except______________?

Avogadro’s number is equal to__________________?

Avogadro number is the number of molecules in one ____________ of a gas?

Average molecular weight of air is about ____________________?

Atoms of the same element, but of different masses are called__________________?

Atomic ______________ of an element is a whole number?

Atmospheric pressure corresponds to a hydrostatic head of_________________?

At standard conditions, N2 + 2O2 ⇌ 2NO2; ΔG° = 100 kJ/mole NO + ½O2 ⇌ 2NO2; ΔG° = -35 kJ/mole The standard free energy of formation of NO in kJ/mole is___________________?

At room temperature, the product [H+] [OH-] in a solution is 10-14 moles/litre. If, [OH-] = 10-6 moles/litre, then the pH of the solution will be ________________________?

At higher temperatures, molal heat capacities for most of the gases (at constant pressure) _______________ with increase in temperature?

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

At a temperature of 0°K, the molecules of a gas have only _______________ energy?

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___________________?

Assuming that CO2 obeys perfect gas law, calculate the density of CO2 (in kg/m3) at 263°C and 2 atm ?

Assuming applicability of ideal gas law, the pure component volume of the vapor in a saturated gas can be calculated from theoretical relationship. The volumetric composition of a vapor saturated gas is independent of the___________________?

Assume that benzene is insoluble in water. The normal boiling points of benzene and water are 80.1 and 100°C respectively. At a pressure of 1 atm, the boiling point of a mixture of benzene and water is__________________?

As per Kirchhoff s equation, the heat of reaction is affected by the__________________?

Applicability of Clausius-Clapeyron Equation is subject to the condition that the __________________?

°API gravity of water at N.T.P. is about__________________?

An ideal gas can be liquefied, because ___________________?

An equation for calculating vapour pressure is given by, log10 P = A – B(t + c). This is called the________________?

An Azeotropic solution of two liquids has boiling point lower than either of them, when it_____________?

An aqueous solution of 2.45% by weight H2SO4 has a specific gravity of 1.011. The composition expressed in normality is______________?

Air at a temperature of 20°C and 750 mm Hg pressure has a relative humidity of 80%. What is its percentage humidity? Vapour pressure of water at 20°C is 17.5 mm Hg?

Addition of zircon to silica refractory brick improves its_________________?

Addition of a non-volatile solute to a solvent produces a ______________ in its solvent?

Addition of a non-volatile solute to a pure solvent ____________________?

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

According to the kinetic theory, the thermal conductivity of a monatomic gas is proportional to___________________?

According to Raoult’s law, “The vapor pressure exerted by component in a solution is proportional to the mole fraction of that component.” Raoult’s law is not applicable under the following assumption/condition?

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 very dilute solution is prepared by dissolving ‘x1’ mole of solute in ‘x2’ mole of a solvent. The mole fraction of solute is approximately equal to_________________?

A vapor whose partial pressure is less than its equilibrium vapor pressure is called the _____________ vapor?

A vapor whose partial pressure is less than its equilibrium vapor pressure is called a ______________ vapor?

A vapor that exists above its critical temperature is termed as a _____________ vapor?

A sugar solution containing _________________ percent sugar is equivalent to 1 Brix?

A solution with reasonably permanent pH is called a/an _______________ solution?

A solution is made by dissolving 1 kilo mole of solute in 2000 kg of solvent. The molality of the solution is_________________?

A solution having a pH value of 5 is less acidic than the one having a pH value of 2 by a factor of ________________?

A saturated vapor on being compressed would___________________?

A sample of well water contains 140 gm/m3 Ca2+ ions and 345 gm/m3 Na+ ions. The hardness of the sample of water, expressed in terms of equivalent CaCO3 in gm/m3 is (assuming atomic masses of Ca :40, Na : 23, C : 12, O : 16) ?

A rigid vessel containing three moles of nitrogen gas at 30°C is heated to 250°C. Assume the average capacities of nitrogen to be Cp = 29.1 J/mole.°C and, Cv = 20.8 J/mole.°C. The heat required, neglecting the heat capacity of the vessel, is__________________?

A reduction process is accompanied with increase in the_______________?