When a system in equilibrium is subjected to a change in temperature, pressure or concentration, the equilibrium is displaced in a direction which tends to undo the effect of the change. This is called the

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When a system in equilibrium is subjected to a change in temperature, pressure or concentration, the equilibrium is displaced in a direction which tends to undo the effect of the change. This is called the

A. Le-Chatelier principle

B. Kopp's rule

C. Law of corresponding state

D. Arrhenius hypothesis

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For an isothermal reversible compression of an ideal gas

A. Only ΔE = 0

B. Only ΔH =0

C. ΔE = ΔH = 0

D. dQ = dE

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(∂E/∂T)_V is the mathematical expression for

A. C_V

B. Enthalpy change

C. Free energy change

D. None of these

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In a reversible process

A. Tds = dE + dW

B. dE - dW = Tds

C. dW - dE = Tds

D. Tds - dW + dE >0

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For a multi-component system, the term chemical potential is equivalent to the

A. Molal concentration difference

B. Molar free energy

C. Partial molar free energy

D. Molar free energy change

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The kinetic energy of gas molecule is zero at

A. 0°C

B. 273°C

C. 100°C

D. -273°C

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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.

A. Van Laar

B. Margules

C. Gibbs-Duhem

D. Gibbs-Duhem-Margules

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For spontaneous changes in an isolated system (S = entropy)

A. ds = 0

B. ds <0

C. ds > 0

D. ds = Constant

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The thermodynamic law, PV^y = constant, is not applicable in case of

A. Ideal compression of air

B. Free expansion of an ideal gas

C. Adiabatic expansion of steam in a turbine

D. Adiabatic compression of a perfect gas

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Specific __________ does not change during phase change at constant temperature and pressure.

A. Entropy

B. Gibbs energy

C. Internal energy

D. Enthalpy

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

A. It is exothermic

B. It is isenthalpic

C. It takes place isothermally

D. It takes place at constant volume

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At equilibrium condition, the chemical potential of a material in different phases in contact with each other is equal. The chemical potential for a real gas (μ) is given by (where, μ = standard chemical potential at unit fugacity (f° = 1 atm.) and the gas behaves ideally.)

A. μ° + RT ln f

B. μ°+ R ln f

C. μ° + T ln f

D. μ° + R/T ln f

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Gibbs free energy (F) is defined as

A. F = E - TS

B. F = H - TS

C. F = H + TS

D. F = E + TS

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The number of degrees of freedom for an azeotropic mixture in a two component vapour-liquid equilibria is/are

A. Zero

B. One

C. Two

D. Three

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Equilibrium constant decreases as the temperature

A. Increases, for an exothermic reaction

B. Decreases, for an exothermic reaction

C. Increases, for an endothermic reaction

D. None of these

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To obtain integrated form of Clausius-Clapeyron equation, ln (P₂/P₁) = (ΔH_V/R) (1/T₁ - 1/T₂) from the exact Clapeyron equation, it is assumed that the

A. Volume of the liquid phase is negligible compared to that of vapour phase

B. Vapour phase behaves as an ideal gas

C. Heat of vaporisation is independent of temperature

D. All (A), (B) & (C)

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If atmospheric temperature and dew point are nearly equal, then the relative humidity is

A. Zero

B. 50%

C. Almost 100%

D. unpredictable

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d_W and d_q are not the exact differential, because q and W are

A. State functions

B. Path functions

C. Intensive properties

D. Extensive properties

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Work done in case of free expansion is

A. Indeterminate

B. Zero

C. Negative

D. None of these

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Pick out the wrong statement.

A. Cp of monatomic gases such as metallic vapor is about 5 kcal/kg.atom

B. The heat capacity of solid inorganic substance is exactly equal to the heat capacity of the substance in the molten state

C. There is an increase in entropy, when a spontaneous change occurs in an isolated system

D. At absolute zero temperature, the heat capacity for many pure crystalline substances is zero

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Work done may be calculated by the expression ∫ p dA for __________ processes.

A. Non-flow reversible

B. Adiabatic

C. Both (A) and (B)

D. Neither (A) nor (B)

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For a constant volume process

A. dE = C_pdT

B. dE = C_vdT

C. dQ = dE + pdV

D. dW = pdV

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The absolute entropy for all crystalline substances at absolute zero temperature is

A. Zero

B. Negative

C. More than zero

D. Indeterminate

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A two stage compressor is used to compress an ideal gas. The gas is cooled to the initial temperature after each stage. The intermediate pressure for the minimum total work requirement should be equal to the __________ mean of P₁ and P₂. (where, P₁ and P₂ are initial and final pressures respectively)

A. Logarithmic

B. Arithmetic

C. Geometric

D. Harmonic

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Degree of freedom of the system ice-watervapour will be

A. 0

B. 1

C. 2

D. 3

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The quantitative effect of temperature on chemical equilibrium is given by the

A. Vant-Hoff equation

B. Le-Chatelier's principle

C. Arrhenius equation

D. None of these

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Heat is added at constant temperature in an ideal __________ cycle.

A. Stirling

B. Brayton

C. Rankine

D. None of these

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An ideal liquid refrigerant should

A. Not have a sub-atmospheric vapour pressure at the temperature in the refrigerator coils

B. Not have unduly high vapour pressure at the condenser temperature

C. Both (A) and (B)

D. Have low specific heat

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Solubility of a substance which dissolves with an increase in volume and liberation of heat will be favoured by the

A. Low pressure and high temperature

B. Low pressure and low temperature

C. High pressure and low temperature

D. High pressure and high temperature

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4 kg moles of an ideal gas expands in vacuum spontaneously. The work done is

A. 4 J

B. ∞

C. 0

D. 8 J

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Joule-Thomson experiment is

A. Isobaric

B. Adiabatic

C. Isenthalpic

D. Both (B) & (C)

Discuss this answer

Accepted Answer

A. Le-Chatelier principle

When a system in equilibrium is subjected to a change in temperature, pressure or concentration, the equilibrium is displaced in a direction which tends to undo the effect of the change. This is called the

Correct Answer :

Show all Chemical Engineering Thermodynamics MCQ

Related Questions

For an isothermal reversible compression of an ideal gas

(∂E/∂T)_V is the mathematical expression for

In a reversible process

For a multi-component system, the term chemical potential is equivalent to the

The kinetic energy of gas molecule is zero at

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.

For spontaneous changes in an isolated system (S = entropy)

The thermodynamic law, PV^y = constant, is not applicable in case of

Specific __________ does not change during phase change at constant temperature and pressure.

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

At equilibrium condition, the chemical potential of a material in different phases in contact with each other is equal. The chemical potential for a real gas (μ) is given by (where, μ = standard chemical potential at unit fugacity (f° = 1 atm.) and the gas behaves ideally.)

Gibbs free energy (F) is defined as

The number of degrees of freedom for an azeotropic mixture in a two component vapour-liquid equilibria is/are

Equilibrium constant decreases as the temperature

To obtain integrated form of Clausius-Clapeyron equation, ln (P₂/P₁) = (ΔH_V/R) (1/T₁ - 1/T₂) from the exact Clapeyron equation, it is assumed that the

If atmospheric temperature and dew point are nearly equal, then the relative humidity is

d_W and d_q are not the exact differential, because q and W are

Work done in case of free expansion is

Pick out the wrong statement.

Work done may be calculated by the expression ∫ p dA for __________ processes.

For a constant volume process

The absolute entropy for all crystalline substances at absolute zero temperature is

Degree of freedom of the system ice-watervapour will be

The quantitative effect of temperature on chemical equilibrium is given by the

Heat is added at constant temperature in an ideal __________ cycle.

An ideal liquid refrigerant should

Solubility of a substance which dissolves with an increase in volume and liberation of heat will be favoured by the

4 kg moles of an ideal gas expands in vacuum spontaneously. The work done is

Joule-Thomson experiment is

Also checkout

When a system in equilibrium is subjected to a change in temperature, pressure or concentration, the equilibrium is displaced in a direction which tends to undo the effect of the change. This is called the

Correct Answer :

Show all Chemical Engineering Thermodynamics MCQ

Related Questions

For an isothermal reversible compression of an ideal gas

(∂E/∂T)V is the mathematical expression for

In a reversible process

For a multi-component system, the term chemical potential is equivalent to the

The kinetic energy of gas molecule is zero at

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.

For spontaneous changes in an isolated system (S = entropy)

The thermodynamic law, PVy = constant, is not applicable in case of

Specific __________ does not change during phase change at constant temperature and pressure.

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

At equilibrium condition, the chemical potential of a material in different phases in contact with each other is equal. The chemical potential for a real gas (μ) is given by (where, μ = standard chemical potential at unit fugacity (f° = 1 atm.) and the gas behaves ideally.)

Gibbs free energy (F) is defined as

The number of degrees of freedom for an azeotropic mixture in a two component vapour-liquid equilibria is/are

Equilibrium constant decreases as the temperature

To obtain integrated form of Clausius-Clapeyron equation, ln (P2/P1) = (ΔHV/R) (1/T1 - 1/T2) from the exact Clapeyron equation, it is assumed that the

If atmospheric temperature and dew point are nearly equal, then the relative humidity is

dW and dq are not the exact differential, because q and W are

Work done in case of free expansion is

Pick out the wrong statement.

Work done may be calculated by the expression ∫ p dA for __________ processes.

For a constant volume process

The absolute entropy for all crystalline substances at absolute zero temperature is

Degree of freedom of the system ice-watervapour will be

The quantitative effect of temperature on chemical equilibrium is given by the

Heat is added at constant temperature in an ideal __________ cycle.

An ideal liquid refrigerant should

Solubility of a substance which dissolves with an increase in volume and liberation of heat will be favoured by the

4 kg moles of an ideal gas expands in vacuum spontaneously. The work done is

Joule-Thomson experiment is

Also checkout

(∂E/∂T)_V is the mathematical expression for

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.

The thermodynamic law, PV^y = constant, is not applicable in case of

To obtain integrated form of Clausius-Clapeyron equation, ln (P₂/P₁) = (ΔH_V/R) (1/T₁ - 1/T₂) from the exact Clapeyron equation, it is assumed that the

d_W and d_q are not the exact differential, because q and W are