What is the value of ln y (where y = activity co-efficient) for ideal gases?

Question

What is the value of ln y (where y = activity co-efficient) for ideal gases?

A. Zero

B. Unity

Correct Answer :

A. Zero

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Specific/molar Gibbs free energy for a pure substance does not change during

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Dry ice is

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Compressibility factor for almost all the gases are approximately same at the same

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For a single component two phase mixture, the number of independent variable properties are

A. Two

B. One

C. Zero

D. Three

Discuss this answer

Second law of thermodynamics is concerned with the

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A gas has a volume of 27.3 c.c. at 0°C. Its volume at 10°C (if pressure remains unchanged) will be __________ c.c.

A. 2.73

B. 28.3

C. 273

D. 283

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Claude gas liquefaction process employs cooling

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A system undergoes a change from a given initial state to a given final state either by an irreversible process or by a reversible process, then (where, Δ S₁ and Δ S_R are the entropy changes of the system for the irreversible and reversible processes respectively)

Discuss this answer

Which of the following units is not present in both the vapor compression refrigeration system and absorption refrigeration system?

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Number of degrees of freedom for a three phase system in equilibrium comprising of three nonreacting chemical species is

A. 2

B. 0

C. 1

D. 3

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The partial pressure of each constituent present in an alloy is __________ the total vapor pressure exerted by the alloy.

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Henry's law is closely obeyed by a gas, when its __________ is extremely high.

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__________ calorimeter is normally used for measuring the dryness fraction of steam, when it is very low.

A. Bucket

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The activity of an ideal gas is numerically __________ its pressure.

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A change in state involving a decrease in entropy can be spontaneous, only if

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At triple point (for one component system), vapour pressure of solid as compared to that of liquid will be

A. More

B. Less

C. Same

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Air-refrigeration cycle

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Fugacity of a component in an ideal gas mixture is equal to the partial pressure of that component in the mixture. The fugacity of each component in a stable homogeneous solution at constant pressure and temperature __________ as its mole fraction increases.

Discuss this answer

For a reversible process involving only pressure-volume work

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Enthalpy of a gas depends upon its

B. Mass

C. Volume

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When a gas is expanded from high pressure region to low pressure region; temperature change occurs. This phenomenon is related to the

Discuss this answer

Claude's liquefaction process employs the cooling of gases by

Discuss this answer

Pick out the correct equation relating 'F' and 'A'.

Discuss this answer

The equation, (d log_e PA/d log_e xA) = (d log_e PA/d log_e xB) applicable to a binary solution of components. A and B in equilibrium with their vapors at constant temperature and pressure is called the __________ equation.

Discuss this answer

C_p - C_v = R is valid for __________ gases.

A. Ideal

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During Joule-Thomson expansion of gases

Discuss this answer

Solid and liquid phases of a substance are in equilibrium at the

Discuss this answer

Isentropic process means a constant __________ process.

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Keeping the pressure constant, to double the volume of a given mass of an ideal gas at 27°C, the temperature should be raised to __________ °C.

A. 270

B. 327

C. 300

D. 540

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Domestic refrigerator usually works on the __________ refrigeration cycle.

A. Carnot

B. Air

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Answer 1

C. Infinity

Answer 2

D. Negative

Answer 3

A. Sublimation

Answer 4

B. Vaporisation

Answer 5

C. Melting

Answer 6

D. Either (A), (B) or (C)

Answer 7

A. Moisture free ice

Answer 8

B. Solid helium

Answer 9

C. Solid carbon dioxide

Answer 10

D. None of these

Answer 11

A. Pressure and temperature

Answer 12

B. Reduced pressure and reduced temperature

Answer 13

C. Critical pressure and critical temperature

Answer 14

D. None of these

Answer 15

A. Amount of energy transferred

Answer 16

B. Direction of energy transfer

Answer 17

C. Irreversible processes only

Answer 18

D. Non-cyclic processes only

Answer 19

A. At constant pressure

Answer 20

B. By throttling

Answer 21

C. By expansion in an engine

Answer 22

D. None of these

Answer 23

A. Δ S₁ is always < Δ S_R

Answer 24

B. Δ S₁ is sometimes > Δ S_R

Answer 25

C. Δ S₁ is always > Δ S_R

Answer 26

D. Δ S₁ is always = Δ S_R

Answer 27

A. Expansion valve

Answer 28

B. Condenser

Answer 29

C. Refrigerator

Answer 30

D. Compressor

Answer 31

A. Less than

Answer 32

B. Equal to

Answer 33

C. More than

Answer 34

D. Either (B) or (C); depends on the type of alloy

Answer 35

A. Pressure

Answer 36

B. Solubility

Answer 37

C. Temperature

Answer 38

D. None of these

Answer 39

B. Throttling

Answer 40

C. Separating

Answer 41

D. A combination of separating & throttling

Answer 42

A. More than

Answer 43

B. Less than

Answer 44

C. Equal to

Answer 45

D. Data insufficient, can't be predicted

Answer 46

A. It is exothermic

Answer 47

B. It is isenthalpic

Answer 48

C. It takes place isothermally

Answer 49

D. It takes place at constant volume

Answer 50

D. More or less; depending on the system

Answer 51

A. Is the most efficient of all refrigeration cycles

Answer 52

B. Has very low efficiency

Answer 53

C. Requires relatively large quantities of air to achieve a significant amount of refrigeration

Answer 54

D. Both (B) and (C)

Answer 55

A. Decreases

Answer 56

B. Decreases exponentially

Answer 57

C. Increases

Answer 58

D. Remain constant

Answer 59

A. (dF)_T, p < 0

Answer 60

B. (dF)_T, p > 0

Answer 61

C. (dF)_T, p = 0

Answer 62

D. (dA)_T, v < 0

Answer 63

A. Temperature

Answer 64

D. Pressure

Answer 65

A. Gibbs-Duhem equation

Answer 66

B. Gibbs-Helmholtz equation

Answer 67

C. Third law of thermodynamics

Answer 68

D. Joule-Thomson effect

Answer 69

A. Expansion in an engine

Answer 70

B. Following a constant pressure cycle

Answer 71

C. Throttling

Answer 72

D. None of these

Answer 73

A. F = A + PV

Answer 74

B. F = E + A

Answer 75

C. F = A - TS

Answer 76

D. F = A + TS

Answer 77

A. Van Laar

Answer 78

B. Margules

Answer 79

C. Gibbs-Duhem

Answer 80

D. Gibbs-Duhem-Margules

Answer 81

B. Very high pressure

Answer 82

C. Very low temperature

Answer 83

D. All of the above

Answer 84

A. Enthalpy remains constant

Answer 85

B. Entropy remains constant

Answer 86

C. Temperature remains constant

Answer 87

D. None of these

Answer 88

A. Critical temperature

Answer 89

B. Melting point

Answer 90

C. Freezing point

Answer 91

D. Both (B) and (C)

Answer 92

A. Enthalpy

Answer 93

B. Pressure

Answer 94

C. Entropy

Answer 95

D. None of these

Answer 96

C. Absorption

Answer 97

D. vapour-ejection

What is the value of ln y (where y = activity co-efficient) for ideal gases?

Correct Answer :

Show all Chemical Engineering Thermodynamics MCQ

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Specific/molar Gibbs free energy for a pure substance does not change during

Dry ice is

Compressibility factor for almost all the gases are approximately same at the same

For a single component two phase mixture, the number of independent variable properties are

Second law of thermodynamics is concerned with the

A gas has a volume of 27.3 c.c. at 0°C. Its volume at 10°C (if pressure remains unchanged) will be __________ c.c.

Claude gas liquefaction process employs cooling

A system undergoes a change from a given initial state to a given final state either by an irreversible process or by a reversible process, then (where, Δ S₁ and Δ S_R are the entropy changes of the system for the irreversible and reversible processes respectively)

Which of the following units is not present in both the vapor compression refrigeration system and absorption refrigeration system?

Number of degrees of freedom for a three phase system in equilibrium comprising of three nonreacting chemical species is

The partial pressure of each constituent present in an alloy is __________ the total vapor pressure exerted by the alloy.

Henry's law is closely obeyed by a gas, when its __________ is extremely high.

__________ calorimeter is normally used for measuring the dryness fraction of steam, when it is very low.

The activity of an ideal gas is numerically __________ its pressure.

A change in state involving a decrease in entropy can be spontaneous, only if

At triple point (for one component system), vapour pressure of solid as compared to that of liquid will be

Air-refrigeration cycle

Fugacity of a component in an ideal gas mixture is equal to the partial pressure of that component in the mixture. The fugacity of each component in a stable homogeneous solution at constant pressure and temperature __________ as its mole fraction increases.

For a reversible process involving only pressure-volume work

Enthalpy of a gas depends upon its

When a gas is expanded from high pressure region to low pressure region; temperature change occurs. This phenomenon is related to the

Claude's liquefaction process employs the cooling of gases by

Pick out the correct equation relating 'F' and 'A'.

The equation, (d log_e PA/d log_e xA) = (d log_e PA/d log_e xB) applicable to a binary solution of components. A and B in equilibrium with their vapors at constant temperature and pressure is called the __________ equation.

C_p - C_v = R is valid for __________ gases.

During Joule-Thomson expansion of gases

Solid and liquid phases of a substance are in equilibrium at the

Isentropic process means a constant __________ process.

Keeping the pressure constant, to double the volume of a given mass of an ideal gas at 27°C, the temperature should be raised to __________ °C.

Domestic refrigerator usually works on the __________ refrigeration cycle.

Also checkout

What is the value of ln y (where y = activity co-efficient) for ideal gases?

Correct Answer :

Show all Chemical Engineering Thermodynamics MCQ

Related Questions

Specific/molar Gibbs free energy for a pure substance does not change during

Dry ice is

Compressibility factor for almost all the gases are approximately same at the same

For a single component two phase mixture, the number of independent variable properties are

Second law of thermodynamics is concerned with the

A gas has a volume of 27.3 c.c. at 0°C. Its volume at 10°C (if pressure remains unchanged) will be __________ c.c.

Claude gas liquefaction process employs cooling

A system undergoes a change from a given initial state to a given final state either by an irreversible process or by a reversible process, then (where, Δ S1 and Δ SR are the entropy changes of the system for the irreversible and reversible processes respectively)

Which of the following units is not present in both the vapor compression refrigeration system and absorption refrigeration system?

Number of degrees of freedom for a three phase system in equilibrium comprising of three nonreacting chemical species is

The partial pressure of each constituent present in an alloy is __________ the total vapor pressure exerted by the alloy.

Henry's law is closely obeyed by a gas, when its __________ is extremely high.

__________ calorimeter is normally used for measuring the dryness fraction of steam, when it is very low.

The activity of an ideal gas is numerically __________ its pressure.

A change in state involving a decrease in entropy can be spontaneous, only if

At triple point (for one component system), vapour pressure of solid as compared to that of liquid will be

Air-refrigeration cycle

Fugacity of a component in an ideal gas mixture is equal to the partial pressure of that component in the mixture. The fugacity of each component in a stable homogeneous solution at constant pressure and temperature __________ as its mole fraction increases.

For a reversible process involving only pressure-volume work

Enthalpy of a gas depends upon its

When a gas is expanded from high pressure region to low pressure region; temperature change occurs. This phenomenon is related to the

Claude's liquefaction process employs the cooling of gases by

Pick out the correct equation relating 'F' and 'A'.

The equation, (d loge PA/d loge xA) = (d loge PA/d loge xB) applicable to a binary solution of components. A and B in equilibrium with their vapors at constant temperature and pressure is called the __________ equation.

Cp - Cv = R is valid for __________ gases.

During Joule-Thomson expansion of gases

Solid and liquid phases of a substance are in equilibrium at the

Isentropic process means a constant __________ process.

Keeping the pressure constant, to double the volume of a given mass of an ideal gas at 27°C, the temperature should be raised to __________ °C.

Domestic refrigerator usually works on the __________ refrigeration cycle.

Also checkout

A system undergoes a change from a given initial state to a given final state either by an irreversible process or by a reversible process, then (where, Δ S₁ and Δ S_R are the entropy changes of the system for the irreversible and reversible processes respectively)

The equation, (d log_e PA/d log_e xA) = (d log_e PA/d log_e xB) applicable to a binary solution of components. A and B in equilibrium with their vapors at constant temperature and pressure is called the __________ equation.

C_p - C_v = R is valid for __________ gases.