Specific __________ does not change during a phase change (e.g. sublimation, melting, vaporisation etc.).

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Specific __________ does not change during a phase change (e.g. sublimation, melting, vaporisation etc.).

A. Entropy

B. Internal energy

C. Enthalpy

D. Gibbs free energy

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The ratio of equilibrium constants (Kp2/Kp1) at two different temperatures is given by

A. (R/ΔH) (1/T₁ - 1/T₂)

B. (ΔH/R) (1/T₁ - 1/T₂)

C. (ΔH/R) (1/T₂ - 1/T₁)

D. (1/R) (1/T₁ - 1/T₂)

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Change of heat content when one mole of compound is burnt in oxygen at constant pressure is called the

A. Calorific value

B. Heat of reaction

C. Heat of combustion

D. Heat of formation

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Change of state namely evaporation condensation, freezing and melting is an __________ process.

A. Isothermal

B. Adiabatic

C. Isobaric

D. Isochoric

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As pressure approaches zero, the ratio of fugacity to pressure (f/P) for a gas approaches

A. Zero

B. Unity

C. Infinity

D. An indeterminate value

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In case of a close thermodynamic system, there is __________ across the boundaries.

A. No heat and mass transfer

B. No mass transfer but heat transfer

C. Mass and energy transfer

D. None of these

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A gas can be liquefied by pressure alone only, when its temperature is __________ its critical temperature.

A. Less than

B. More than

C. Equal to or higher than

D. Less than or equal to

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A/an __________ system is exemplified by a vessel containing a volatile liquid in contact with its vapor.

A. Isolated

B. Closed

C. Open

D. None of these

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Free energy changes for two reaction mechanism 'X' and 'Y are respectively - 15 and - 5 units. It implies that X is

A. Slower than Y

B. Faster than Y

C. Three times slower than Y

D. Three times faster than Y

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Dryness fraction of wet steam is defined as the ratio of mass of vapour in the mixture to the mass of mixture __________ calorimeter is not used for measuring the dryness fraction of steam.

A. Bomb

B. Separating

C. Bucket

D. Throttling

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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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In case of the decomposition of hydroiodic acid (2HI H₂ + I₂), addition of H₂ (at equilibrium condition) will

A. Increase the partial pressure of I₂

B. Decrease the partial pressure of HI

C. Diminish the degree of dissociation of HI

D. None of these

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Equilibrium constant of a reaction varies with the

A. Initial concentration of the reactant

B. Pressure

C. Temperature

D. None of these

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__________ decreases during adiabatic throttling of a perfect gas.

A. Entropy

B. Temperature

C. Enthalpy

D. Pressure

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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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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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1st law of thermodynamics is nothing but the law of conservation of

A. Momentum

B. Mass

C. Energy

D. None of these

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The first law of thermodynamics is a restatement of the law of conservation of

A. Mass

B. Energy

C. Momentum

D. None of these

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Air enters an adiabatic compressor at 300K. The exit temperature for a compression ratio of 3, assuming air to be an ideal gas (Y = C_p/C_v = 7/5) and the process to be reversible, is

A. 300 × (3^2/7)

B. 300 × (3^3/5)

C. 300 × (33^3/7)

D. 300 × (3^5/7)

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The point at which all the three (solid, liquid and gas) phases co-exist, is known as the __________ point.

A. Freezing

B. Triple

C. Boiling

D. Boyle

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While dissolving a gas into a liquid at a constant temperature, the ratio of the concentration of the gas in the solution phase and in the gaseous phase is

A. Infinity

B. Unity

C. Constant

D. Negative

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Ideal refrigeration cycle is

A. Same as Carnot cycle

B. Same as reverse Carnot cycle

C. Dependent on the refrigerant's properties

D. The least efficient of all refrigeration processes

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One mole of nitrogen at 8 bar and 600 K is contained in a piston-cylinder arrangement. It is brought to 1 bar isothermally against a resisting pressure of 1 bar. The work done (in Joules) by the gas is

A. 30554

B. 10373

C. 4988.4

D. 4364.9

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The amount of heat required to decompose a compound into its elements is __________ the heat of formation of that compound from its elements.

A. Less than

B. More than

C. Same as

D. Not related to

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All gases during throttling process at atmospheric temperature and pressure show a cooling effect except

A. CO₂

B. H₂

C. O₂

D. N₂

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Pressure-enthalpy chart is useful in refrigeration. The change in internal energy of an ideal fluid used in ideal refrigeration cycle is

A. Positive

B. Negative

C. Zero

D. Infinity

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The internal energy of an ideal gas does not change in a reversible __________ process.

A. Isothermal

B. Adiabatic

C. Isobaric

D. Isometric

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At 60° C, vapour pressure of methanol and water are 84.562 kPa and 19.953 kPa respectively. An aqueous solution of methanol at 60° C exerts a pressure of 39.223 kPa; the liquid phase and vapour phase mole fractions of methanol are 0.1686 and 0.5714 respectively. Activity co-efficient of methanol is

A. 1.572

B. 1.9398

C. 3.389

D. 4.238

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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)

A. Δ S₁ is always < Δ S_R

B. Δ S₁ is sometimes > Δ S_R

C. Δ S₁ is always > Δ S_R

D. Δ S₁ is always = Δ S_R

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With increase in compression ratio, the efficiency of the otto engine

A. Increases

B. Decreases

C. Remain constant

D. Increases linearly

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At __________ point, all the three phases (i.e. solid, liquid and gas) co-exist.

A. Eutectic

B. Triple

C. Plait

D. Critical

Discuss this answer

Accepted Answer

D. Gibbs free energy

Specific __________ does not change during a phase change (e.g. sublimation, melting, vaporisation etc.).

Correct Answer :

Show all Chemical Engineering Thermodynamics MCQ

Related Questions

The ratio of equilibrium constants (Kp2/Kp1) at two different temperatures is given by

Change of heat content when one mole of compound is burnt in oxygen at constant pressure is called the

Change of state namely evaporation condensation, freezing and melting is an __________ process.

As pressure approaches zero, the ratio of fugacity to pressure (f/P) for a gas approaches

In case of a close thermodynamic system, there is __________ across the boundaries.

A gas can be liquefied by pressure alone only, when its temperature is __________ its critical temperature.

A/an __________ system is exemplified by a vessel containing a volatile liquid in contact with its vapor.

Free energy changes for two reaction mechanism 'X' and 'Y are respectively - 15 and - 5 units. It implies that X is

Dryness fraction of wet steam is defined as the ratio of mass of vapour in the mixture to the mass of mixture __________ calorimeter is not used for measuring the dryness fraction of steam.

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

In case of the decomposition of hydroiodic acid (2HI H₂ + I₂), addition of H₂ (at equilibrium condition) will

Equilibrium constant of a reaction varies with the

__________ decreases during adiabatic throttling of a perfect gas.

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

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

1st law of thermodynamics is nothing but the law of conservation of

The first law of thermodynamics is a restatement of the law of conservation of

Air enters an adiabatic compressor at 300K. The exit temperature for a compression ratio of 3, assuming air to be an ideal gas (Y = C_p/C_v = 7/5) and the process to be reversible, is

The point at which all the three (solid, liquid and gas) phases co-exist, is known as the __________ point.

While dissolving a gas into a liquid at a constant temperature, the ratio of the concentration of the gas in the solution phase and in the gaseous phase is

Ideal refrigeration cycle is

One mole of nitrogen at 8 bar and 600 K is contained in a piston-cylinder arrangement. It is brought to 1 bar isothermally against a resisting pressure of 1 bar. The work done (in Joules) by the gas is

The amount of heat required to decompose a compound into its elements is __________ the heat of formation of that compound from its elements.

All gases during throttling process at atmospheric temperature and pressure show a cooling effect except

Pressure-enthalpy chart is useful in refrigeration. The change in internal energy of an ideal fluid used in ideal refrigeration cycle is

The internal energy of an ideal gas does not change in a reversible __________ process.

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)

With increase in compression ratio, the efficiency of the otto engine

At __________ point, all the three phases (i.e. solid, liquid and gas) co-exist.

Also checkout

Specific __________ does not change during a phase change (e.g. sublimation, melting, vaporisation etc.).

Correct Answer :

Show all Chemical Engineering Thermodynamics MCQ

Related Questions

The ratio of equilibrium constants (Kp2/Kp1) at two different temperatures is given by

Change of heat content when one mole of compound is burnt in oxygen at constant pressure is called the

Change of state namely evaporation condensation, freezing and melting is an __________ process.

As pressure approaches zero, the ratio of fugacity to pressure (f/P) for a gas approaches

In case of a close thermodynamic system, there is __________ across the boundaries.

A gas can be liquefied by pressure alone only, when its temperature is __________ its critical temperature.

A/an __________ system is exemplified by a vessel containing a volatile liquid in contact with its vapor.

Free energy changes for two reaction mechanism 'X' and 'Y are respectively - 15 and - 5 units. It implies that X is

Dryness fraction of wet steam is defined as the ratio of mass of vapour in the mixture to the mass of mixture __________ calorimeter is not used for measuring the dryness fraction of steam.

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

In case of the decomposition of hydroiodic acid (2HI H2 + I2), addition of H2 (at equilibrium condition) will

Equilibrium constant of a reaction varies with the

__________ decreases during adiabatic throttling of a perfect gas.

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

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

1st law of thermodynamics is nothing but the law of conservation of

The first law of thermodynamics is a restatement of the law of conservation of

Air enters an adiabatic compressor at 300K. The exit temperature for a compression ratio of 3, assuming air to be an ideal gas (Y = Cp/Cv = 7/5) and the process to be reversible, is

The point at which all the three (solid, liquid and gas) phases co-exist, is known as the __________ point.

While dissolving a gas into a liquid at a constant temperature, the ratio of the concentration of the gas in the solution phase and in the gaseous phase is

Ideal refrigeration cycle is

One mole of nitrogen at 8 bar and 600 K is contained in a piston-cylinder arrangement. It is brought to 1 bar isothermally against a resisting pressure of 1 bar. The work done (in Joules) by the gas is

The amount of heat required to decompose a compound into its elements is __________ the heat of formation of that compound from its elements.

All gases during throttling process at atmospheric temperature and pressure show a cooling effect except

Pressure-enthalpy chart is useful in refrigeration. The change in internal energy of an ideal fluid used in ideal refrigeration cycle is

The internal energy of an ideal gas does not change in a reversible __________ process.

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)

With increase in compression ratio, the efficiency of the otto engine

At __________ point, all the three phases (i.e. solid, liquid and gas) co-exist.

Also checkout

In case of the decomposition of hydroiodic acid (2HI H₂ + I₂), addition of H₂ (at equilibrium condition) will

Air enters an adiabatic compressor at 300K. The exit temperature for a compression ratio of 3, assuming air to be an ideal gas (Y = C_p/C_v = 7/5) and the process to be reversible, is

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)