Enthalpy of a vapor gas mixture may be increased by increasing the%!

Solvent is from high concentration to low concentration region

Solvent is from low concentration to high concentration region

Solvent is from high concentration to low concentration region

Avogadro's number is equal to%!

Temperature at constant humidity

Humidity at constant temperature

One micron is equal to%!

10‚Äö√Ö¬™‚Äö√Ö¬• mm

10‚Äö√Ö¬™‚Äö√Ö¬• cm

10‚Äö√Ö¬™‚Äö√Ö‚àÇ m

Pick out the wrong conversion formula for the conversion of weight units :%!

1 U.S. ton = 907 kg = 0.907 tonne = 0.893 ton

1 ton = 2240 lbs = 1016 kg = 1.016 tonnes = 1.12 U.S. tons

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

Either more or less; depends on the solvent

A bypass stream in a chemical process is useful, because it%!

Facilitates better control of the process

Increases the yield of products

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

Degrees of freedom will be equal to the number of components for a system comprising of%!

Partially miscible two liquid components system having two phases

Two liquid components and one solute (soluble in both the liquids)

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

*$_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

*$_The heats of vaporisation of CS‚Äö√á√á, C‚Äö√á√áH‚Äö√á√ñOH &H‚Äö√á√áO are 26.8, 38.6 & 40.6 KJ/kg mole respectively. The order of decreasing inter-molecular forces in these liquids is?

CS‚Äö√á√á > C‚Äö√á√áH‚Äö√á√ñOH > H‚Äö√á√áO

H‚Äö√á√áO > C‚Äö√á√áH‚Äö√á√ñOH > CS‚Äö√á√á

CS‚Äö√á√á > C‚Äö√á√áH‚Äö√á√ñOH > H‚Äö√á√áO

H‚Äö√á√áO > CS‚Äö√á√á > C‚Äö√á√áH‚Äö√á√ñOH

CS‚Äö√á√á > H‚Äö√á√áO > C‚Äö√á√áH‚Äö√á√ñOH

336 + Mcqs in Stoichiometry in Chemical Engineering Page 1 McqOptions

1.	For an endothermic reaction, the minimum value of energy of activation will be (where, ≈í√ÆH = enthalpy of the reaction)~!
A.	≈í√Æ H
B.	>≈í√ÆH
C.	<≈í√ÆH
D.	0
Answer» C. <≈í√ÆH

Discussion

2.	The value of (Cp - Cv)for a real gas obeying Vander Wall's equation is~!
A.	R
B.	> R
C.	< R
D.	0.5 R
Answer» C. < R

Discussion

3.	Isotonic solutions must have the same%!
A.	W/m¬¨‚â§.¬¨‚àûK
B.	J/kg.¬¨‚àûK
C.	W/m.¬¨‚àûK
D.	J/m¬¨‚â•. ¬¨‚àûK
Answer» C. W/m.¬¨‚àûK

Discussion

4.	In osmosis through a semi-permeable membrane, diffusion of the%!
A.	Viscosity
B.	Molar concentration
C.	Normality
D.	Critical temperature
Answer» C. Normality

Discussion

5.	Enthalpy of a vapor gas mixture may be increased by increasing the%!
A.	Solvent is from low concentration to high concentration region
B.	Solvent is from high concentration to low concentration region
C.	Solute takes place
D.	None of these
Answer» B. Solvent is from high concentration to low concentration region

Discussion

6.	Avogadro's number is equal to%!
A.	Temperature at constant humidity
B.	Humidity at constant temperature
C.	Temperature and the humidity
D.	All of the above
Answer» E.

Discussion

7.	The hydroxyl ion (OH?) concentration in a solution having pH value 3 will be%!
A.
Answer» B.

Discussion

8.	An aqueous solution of 2.45% by weight H‚Äö√á√áSO‚Äö√á√ë 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

9.	At room temperature, the product [H‚Äö√Ö‚à´] [OH‚Äö√Ö¬™] in a solution is 10‚Äö√Ö¬™¬¨œÄ‚Äö√Ö¬• moles/litre. If, [OH‚Äö√Ö¬™] = 10‚Äö√Ö¬™‚Äö√Ö‚àÇ moles/litre, then the pH of the solution will be%!
A.	6
B.	8
C.	10
D.	12
Answer» C. 10

Discussion

10.	On addition of 1 c.c. of dilute hydrochloric acid (1% concentration) to 80 c.c. of a buffer solution of pH = 4, the pH of the solution becomes%!
A.	1
B.	8
C.	4
D.	2
Answer» D. 2

Discussion

11.	A gaseous mixture contains 14 kg of N‚Äö√á√á, 16 kg of O‚Äö√á√á and 17 kg of NH‚Äö√á√â. The mole fraction of oxygen is%!
A.	0.16
B.	0.33
C.	0.66
D.	0.47
Answer» C. 0.66

Discussion

12.	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

13.	The vapor pressure of the solvent decreased by 10 mm Hg, when a non-volatile solute was added to the solvent. The mole fraction of the solute in the solution is 0.2. What should be the mole fraction of the solvent, if the decrease in vapor pressure of the solvent is required to be 20 mm Hg.?
A.	0.2
B.	0.1
C.	0.4
D.	0.6
Answer» E.

Discussion

14.	The vapour pressure of water is given by, in Psat = A - (5000/T), where A is a constant, Psat is the vapour pressure in atm. and T is the temperature in K.The vapor pressure of water in atm. at 50¬¨‚àûC is approximately%!
A.	0.07
B.	0.09
C.	0.11
D.	0.13
Answer» E.

Discussion

15.	One micron is equal to%!
A.	10‚Äö√Ö¬™‚Äö√Ö¬• mm
B.	10‚Äö√Ö¬™‚Äö√Ö¬• cm
C.	10‚Äö√Ö¬™‚Äö√Ö‚àÇ m
D.	Both B & C
Answer» E.

Discussion

16.	¬¨‚àûAPI gravity of water at N.T.P. is about%!
A.	0
B.	1
C.	10
D.	100
Answer» D. 100

Discussion

17.	Pick out the wrong conversion formula for the conversion of weight units :%!
A.	1 tonne = 1000 kg = 22.046 lbs
B.	1 U.S. ton = 907 kg = 0.907 tonne = 0.893 ton
C.	1 ton = 2240 lbs = 1016 kg = 1.016 tonnes = 1.12 U.S. tons
D.	None of these
Answer» E.

Discussion

18.	Number of gm moles of solute dissolved in 1 kg of solvent is called its%!
A.	Normality
B.	Molarity
C.	Molality
D.	Formality
Answer» D. Formality

Discussion

19.	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

20.	Which of the following gases will have the- highest kinetic energy per mole at the same pressure & temperature?%!
A.	Chlorine
B.	Nitrogen
C.	Ethane
D.	All of the above
Answer» E.

Discussion

21.	Assuming that CO‚Äö√á√á obeys perfect gas law, calculate the density of CO‚Äö√á√á (in kg/m¬¨‚â•) at 263¬¨‚àûC and 2 atm.%!
A.	1
B.	2
C.	3
D.	4
Answer» C. 3

Discussion

22.	The temperature of a gas in a closed container is 27¬¨‚àû C. If the temperature of the gas is incresed to 300¬¨‚àû C, then the pressure exerted is%!
A.	Doubled
B.	Halved
C.	Trebled
D.	Unpredictable
Answer» E.

Discussion

23.	A gas at 0¬¨‚àûC is cooled at constant pressure until its volume becomes half the original volume. The temperature of the gas at this state will be%!
A.	-136.5¬¨‚àûC
B.	- 136.5¬¨‚àûK
C.	-273¬¨‚àûC
D.	0¬¨‚àûK
Answer» B. - 136.5¬¨‚àûK

Discussion

24.	The heat evolved in the combustion of benzene is represented by the equation: C‚Äö√á√úH‚Äö√á√ú + 7.5 O‚Äö√á√á = 6CO‚Äö√á√á + 3H‚Äö√á√áO, ≈í√ÆH = 3264.6 kJ/kg. mole The heat energy change, when 39 gm of C‚Äö√á√úH‚Äö√á√ú is burnt in an open container, will be __________ kJ/kgmole.%!
A.	+816.15
B.	+1632.3
C.	-1632.3
D.	-2448.45
Answer» D. -2448.45

Discussion

25.	The boiling points for pure water and pure toluene are 100¬¨‚àûC and 110.6¬¨‚àûC respectively. Toluene and water are completely immiscible in each other. A well agitated equimolar mixture of toluene and water are prepared. If, at a total pressure of one standard atm. exerted by the vapours of water and toluene, the mole fraction of water Xw in the vapour phase satisfies%!
A.	0 < Xw < 0.5
B.	Xw = 0.5
C.	0.5 < Xw < 1.0
D.	Xw = 1.0
Answer» D. Xw = 1.0

Discussion

26.	The value of the gas-law constant 'R' is 1.987%!
A.	Kcal/kg-mole.¬¨‚àûC
B.	Btu/lb-mole.¬¨‚àûR
C.	Kcal/kg-mole.¬¨‚àûK
D.	Both B & C
Answer» E.

Discussion

27.	2 litres of nitrogen at N.T.P. weighs __________ gms.%!
A.	14
B.	2.5
C.	28
D.	1.25
Answer» C. 28

Discussion

28.	The vapor pressure of the solvent decreased by 10 mm Hg, when a non-volatile solute was added to the solvent. The mole fraction of the solute in the solution is 0.2. What should be the mole fraction of the solvent, if the decrease in vapor pressure of the solvent is required to be 20 mm Hg.?%!
A.	0.2
B.	0.1
C.	0.4
D.	0.6
Answer» E.

Discussion

29.	A bypass stream in a chemical process is useful, because it%!
A.	Facilitates better control of the process
B.	Improves the conversion
C.	Increases the yield of products
D.	None of these
Answer» B. Improves the conversion

Discussion

30.	In a mixture of benzene vapor and nitrogen gas at a total pressure of 900 mm Hg, if the absolute humidity of benzene is 0.2 kg benzene/kg nitrogen, the partial pressure of benzene in mm Hg is%!
A.	180
B.	60.3
C.	720
D.	200
Answer» C. 720

Discussion

31.	Kopp's rule is helpful in finding the%!
A.	Heat capacities of solids
B.	Heat capacities of gases
C.	Molal heat capacities of gases
D.	Activation energy
Answer» B. Heat capacities of gases

Discussion

32.	In case of vapor-liquid equilibria, which of the following does not account for gas phase deviation from ideality?%!
A.	Use of equation of state
B.	Fugacity co-efficient
C.	Activity co-efficient
D.	None of these
Answer» D. None of these

Discussion

33.	In __________ process, ions of salts react with water to produce acidity or alkalinity.%!
A.	Hydration
B.	Hydrolysis
C.	Electrolysis
D.	Dialysis
Answer» C. Electrolysis

Discussion

34.	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

35.	How many phases are present at eutectic point?%!
A.	1
B.	2
C.	3
D.	Unpredictable
Answer» D. Unpredictable

Discussion

36.	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

37.	As per Kirchoff s equation, the heat of reaction is affected by the%!
A.	Pressure
B.	Volume
C.	Temperature
D.	Molecularity
Answer» D. Molecularity

Discussion

38.	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

39.	Degrees of freedom will be equal to the number of components for a system comprising of%!
A.	Only soluble liquid components
B.	Partially miscible two liquid components system having two phases
C.	Two liquid components and one solute (soluble in both the liquids)
D.	None of these
Answer» B. Partially miscible two liquid components system having two phases

Discussion

40.	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

41.	*$_In case of vapor-liquid equilibria, which of the following does not account for gas phase deviation from ideality??
A.	Use of equation of state
B.	Fugacity co-efficient
C.	Activity co-efficient
D.	None of these
Answer» D. None of these

Discussion

42.	*$_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

43.	*$_In __________ process, ions of salts react with water to produce acidity or alkalinity.?
A.	Hydration
B.	Hydrolysis
C.	Electrolysis
D.	Dialysis
Answer» C. Electrolysis

Discussion

44.	*$_In a mixture of benzene vapor and nitrogen gas at a total pressure of 900 mm Hg, if the absolute humidity of benzene is 0.2 kg benzene/kg nitrogen, the partial pressure of benzene in mm Hg is?
A.	180
B.	60.3
C.	720
D.	200
Answer» C. 720

Discussion

45.	*$_How many phases are present at eutectic point??
A.	1
B.	2
C.	3
D.	Unpredictable
Answer» D. Unpredictable

Discussion

46.	*$_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

47.	*$_Kopp's rule is helpful in finding the?
A.	Heat capacities of solids
B.	Heat capacities of gases
C.	Molal heat capacities of gases
D.	Activation energy
Answer» B. Heat capacities of gases

Discussion

48.	*$_The heats of vaporisation of CS‚Äö√á√á, C‚Äö√á√áH‚Äö√á√ñOH &H‚Äö√á√áO are 26.8, 38.6 & 40.6 KJ/kg mole respectively. The order of decreasing inter-molecular forces in these liquids is?
A.	H‚Äö√á√áO > C‚Äö√á√áH‚Äö√á√ñOH > CS‚Äö√á√á
B.	CS‚Äö√á√á > C‚Äö√á√áH‚Äö√á√ñOH > H‚Äö√á√áO
C.	H‚Äö√á√áO > CS‚Äö√á√á > C‚Äö√á√áH‚Äö√á√ñOH
D.	CS‚Äö√á√á > H‚Äö√á√áO > C‚Äö√á√áH‚Äö√á√ñOH
Answer» B. CS‚Äö√á√á > C‚Äö√á√áH‚Äö√á√ñOH > H‚Äö√á√áO

Discussion

49.	*$_1 kg of calcium carbide (CaC‚Äö√á√á) produces about 0.41 kg of acetylene gas on treatment with water. How many hours of service can be derived from 1 kg of calcium carbide in an acetylene lamp burning 35 litres of gas at NTP per hour??
A.	5
B.	10
C.	15
D.	20
Answer» C. 15

Discussion

50.	*$_Heat of __________ of a fuel is called its calorific value.?
A.	Formation
B.	Combustion
C.	Reaction
D.	Vaporisation
Answer» C. Reaction

Discussion

Explore topic-wise MCQs in Chemical Engineering.

For an endothermic reaction, the minimum value of energy of activation will be (where, ≈í√ÆH = enthalpy of the reaction)~!

The value of (Cp - Cv)for a real gas obeying Vander Wall's equation is~!

Isotonic solutions must have the same%!

In osmosis through a semi-permeable membrane, diffusion of the%!

Enthalpy of a vapor gas mixture may be increased by increasing the%!

Avogadro's number is equal to%!

The hydroxyl ion (OH?) concentration in a solution having pH value 3 will be%!

An aqueous solution of 2.45% by weight H‚Äö√á√áSO‚Äö√á√ë has a specific gravity of 1.011. The composition expressed in normality is%!

At room temperature, the product [H‚Äö√Ö‚à´] [OH‚Äö√Ö¬™] in a solution is 10‚Äö√Ö¬™¬¨œÄ‚Äö√Ö¬• moles/litre. If, [OH‚Äö√Ö¬™] = 10‚Äö√Ö¬™‚Äö√Ö‚àÇ moles/litre, then the pH of the solution will be%!

On addition of 1 c.c. of dilute hydrochloric acid (1% concentration) to 80 c.c. of a buffer solution of pH = 4, the pH of the solution becomes%!

A gaseous mixture contains 14 kg of N‚Äö√á√á, 16 kg of O‚Äö√á√á and 17 kg of NH‚Äö√á√â. The mole fraction of oxygen is%!

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%!

The vapor pressure of the solvent decreased by 10 mm Hg, when a non-volatile solute was added to the solvent. The mole fraction of the solute in the solution is 0.2. What should be the mole fraction of the solvent, if the decrease in vapor pressure of the solvent is required to be 20 mm Hg.?

The vapour pressure of water is given by, in Psat = A - (5000/T), where A is a constant, Psat is the vapour pressure in atm. and T is the temperature in K.The vapor pressure of water in atm. at 50¬¨‚àûC is approximately%!

One micron is equal to%!

¬¨‚àûAPI gravity of water at N.T.P. is about%!

Pick out the wrong conversion formula for the conversion of weight units :%!

Number of gm moles of solute dissolved in 1 kg of solvent is called its%!

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

Which of the following gases will have the- highest kinetic energy per mole at the same pressure & temperature?%!

Assuming that CO‚Äö√á√á obeys perfect gas law, calculate the density of CO‚Äö√á√á (in kg/m¬¨‚â•) at 263¬¨‚àûC and 2 atm.%!

The temperature of a gas in a closed container is 27¬¨‚àû C. If the temperature of the gas is incresed to 300¬¨‚àû C, then the pressure exerted is%!

A gas at 0¬¨‚àûC is cooled at constant pressure until its volume becomes half the original volume. The temperature of the gas at this state will be%!

The value of the gas-law constant 'R' is 1.987%!

2 litres of nitrogen at N.T.P. weighs __________ gms.%!

The vapor pressure of the solvent decreased by 10 mm Hg, when a non-volatile solute was added to the solvent. The mole fraction of the solute in the solution is 0.2. What should be the mole fraction of the solvent, if the decrease in vapor pressure of the solvent is required to be 20 mm Hg.?%!

A bypass stream in a chemical process is useful, because it%!

In a mixture of benzene vapor and nitrogen gas at a total pressure of 900 mm Hg, if the absolute humidity of benzene is 0.2 kg benzene/kg nitrogen, the partial pressure of benzene in mm Hg is%!

Kopp's rule is helpful in finding the%!

In case of vapor-liquid equilibria, which of the following does not account for gas phase deviation from ideality?%!

In __________ process, ions of salts react with water to produce acidity or alkalinity.%!

An azeotropic solution of two liquids has boiling point lower than either of them, when it%!

How many phases are present at eutectic point?%!

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.%!

As per Kirchoff s equation, the heat of reaction is affected by the%!

Atoms of the same element, but of different masses are called%!

Degrees of freedom will be equal to the number of components for a system comprising of%!

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

*$_In case of vapor-liquid equilibria, which of the following does not account for gas phase deviation from ideality??

*$_An azeotropic solution of two liquids has boiling point lower than either of them, when it?

*$_In __________ process, ions of salts react with water to produce acidity or alkalinity.?

*$_In a mixture of benzene vapor and nitrogen gas at a total pressure of 900 mm Hg, if the absolute humidity of benzene is 0.2 kg benzene/kg nitrogen, the partial pressure of benzene in mm Hg is?

*$_How many phases are present at eutectic point??

*$_A vapor whose partial pressure is less than its equilibrium vapor pressure is called the __________ vapor.?

*$_Kopp's rule is helpful in finding the?

*$_The heats of vaporisation of CS‚Äö√á√á, C‚Äö√á√áH‚Äö√á√ñOH &H‚Äö√á√áO are 26.8, 38.6 & 40.6 KJ/kg mole respectively. The order of decreasing inter-molecular forces in these liquids is?

*$_1 kg of calcium carbide (CaC‚Äö√á√á) produces about 0.41 kg of acetylene gas on treatment with water. How many hours of service can be derived from 1 kg of calcium carbide in an acetylene lamp burning 35 litres of gas at NTP per hour??

*$_Heat of __________ of a fuel is called its calorific value.?