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What is the correct answer?

4

For an irreversible process involving only pressure-volume work

A. (dF)T, p <0

B. (dF)T, p = 0

C. (dF)T, p > 0

D. (dA)T, v >0

Correct Answer :

A. (dF)T, p <0


Related Questions

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4

Joule-Thomson co-efficient depends on the

A. Pressure

B. Temperature

C. Both (A) & (B)

D. Neither (A) nor (B)

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4

The change in __________ is equal to the reversible work for compression in steady state flow process under isothermal condition.

A. Internal energy

B. Enthalpy

C. Gibbs free energy

D. Helmholtz free energy

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4

If an ideal solution is formed by mixing two pure liquids in any proportion, then the __________ of mixing is zero

A. Enthalpy

B. Volume

C. Both 'a' & 'b'

D. Neither 'a' nor 'b'

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4

A solute distributes itself between two nonmiscible solvents in contact with each other in such a way that, at a constant temperature, the ratio of its concentrations in two layers is constant, irrespective of its total amount. This is

A. The distribution law

B. Followed from Margules equation

C. A corollary of Henry's law

D. None of these

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4

Compound having large heat of formation is

A. More stable

B. Less stable

C. Not at all stable (like nascent O2)

D. Either more or less stable; depends on the compound

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4

The standard state of a gas (at a given temperature) is the state in which fugacity is equal to

A. Unity

B. Activity

C. Both (A) & (B)

D. Neither (A) nor (B)

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4

Heat of reaction at constant volume is identified with __________ change.

A. Enthalpy

B. Internal energy

C. Either (A) or (B)

D. Neither (A) nor (B)

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4

The expression for entropy change given by, ΔS = - nR ln (P2/P1), holds good for

A. Expansion of a real gas

B. Reversible isothermal volume change

C. Heating of an ideal gas

D. Cooling of a real gas

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4

In a homogeneous solution, the fugacity of a component depends upon the

A. Pressure

B. Composition

C. Temperature

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

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4

The gas law (PV = RT) is true for an __________ change.

A. Isothermal

B. Adiabatic

C. Both (A) & (B)

D. Neither (A) nor (B)

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4

Entropy change for an irreversible isolated system is

A.

B. 0

C. < 0

D. > 0

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4

The equation, PV = nRT, is best obeyed by gases at

A. Low pressure & high temperature

B. High pressure & low temperature

C. Low pressure & low temperature

D. None of these

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4

PVγ = Constant (where, γ = Cp/Cv) is valid for a/an __________ process.

A. Isothermal

B. Isentropic

C. Isobaric

D. Adiabatic

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4

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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4

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

A. Two

B. One

C. Zero

D. Three

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4

With increase in reduced temperature, the fugacity co-efficient of a gas at constant reduced pressure

A. Increases

B. Decreases

C. Remain same

D. Decreases linearly

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4

For organic compounds, group contribution method can be used for the estimation of

A. Critical properties

B. Specific gravity

C. Specific volume

D. Thermal conductivity

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4

Number of phases in a colloidal system is:

A. 1

B. 2

C. 3

D. 4

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4

Which of the following is not an equation of state?

A. Bertholet equation

B. Clausius-Clapeyron equation

C. Beattie-Bridgeman equation

D. None of these

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4

Mollier chart is a __________ plot.

A. Pressure vs. enthalpy

B. Pressure vs. volume

C. Enthalpy vs. entropy

D. Temperature vs. entropy

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4

If two gases have same reduced temperature and reduced pressure, then they will have the same

A. Volume

B. Mass

C. Critical temperature

D. None of these

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4

The equation DU = Tds - PdV is applicable to infinitesimal changes occuring in

A. An open system of constant composition

B. A closed system of constant composition

C. An open system with changes in composition

D. A closed system with changes in composition

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4

Thermal efficiency of a Carnot engine can approach 100%, only when the temperature of the

A. Cold reservoir approaches zero

B. Hot reservoir approaches infinity

C. Either (A) or (B)

D. Neither (A) nor (B)

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4

Entropy of a substance remains constant during a/an __________ change.

A. Reversible isothermal

B. Irreversible isothermal

C. Reversible adiabatic

D. None of these

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4

(1/V) (∂V/∂T)P is the mathematical expression

A. Joule-Thomson co-efficient

B. Specific heat at constant pressure (Cp)

C. co-efficient of thermal expansion

D. Specific heat at constant volume (CV)

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4

An irreversible process

A. Is the analog of linear frictionless motion in machines

B. Is an idealised visualisation of behaviour of a system

C. Yields the maximum amount of work

D. Yields an amount of work less than that of a reversible process

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4

The total change in the enthalpy of a system is independent of the

A. Number of intermediate chemical reactions involved

B. Pressure and temperature

C. State of combination and aggregation in the beginning and at the end of the reaction

D. None of these

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4

The value of gas constant 'R' is

A. 1.987 cal/gm mole °K

B. 1.987 BTU/lb. mole °R

C. Both (A) and (B)

D. Neither (A) nor (B)

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4

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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4

The enthalpy change when ammonia gas is dissolved in water is called the heat of

A. Solution

B. Formation

C. Dilution

D. Combustion