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4

In any spontaneous process,

A. Only F decreases

B. Only A decreases

C. Both F and A decreases

D. Both F and A increase

Correct Answer :

C. Both F and A decreases


Related Questions

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4

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

A. Gibbs-Duhem equation

B. Gibbs-Helmholtz equation

C. Third law of thermodynamics

D. Joule-Thomson effect

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4

A system is said to be at equilibrium, if the entropy of the system has reached __________ value.

A. Minimum

B. Zero

C. Maximum

D. None of these

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4

Number of components (C), phase (P) and degrees of freedom (F) are related by Gibbs phase rule as

A. P + F - C = 2

B. C = P - F + 2

C. F = C - P - 2

D. P = F - C - 2

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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

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

A. CV

B. Enthalpy change

C. Free energy change

D. None of these

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4

Joule-Thomson Co-efficient at any point on the inversion curve is

A.

B. +ve

C. 0

D. -ve

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4

In an irreversible process

A. Tds = dE - dW = 0

B. dE - dW - Tds = 0

C. Tds - dE + dW < 0

D. Tds - dT + dW < 0

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4

Extensive properties of a thermodynamic system depend upon the __________ of the system.

A. Specific volume

B. Temperature

C. Mass

D. Pressure

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4

Fugacity and pressure are numerically equal, when the gas is

A. In standard state

B. At high pressure

C. At low temperature

D. In ideal state

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4

The expression, nCv(T2 - T1), is for the __________ of an ideal gas.

A. Work done under adiabatic condition

B. Co-efficient of thermal expansion

C. Compressibility

D. None of these

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4

Throttling (Joule-Thomson effect) process is a constant __________ process.

A. Enthalpy

B. Entropy

C. Pressure

D. None of these

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4

Pick out the wrong statement.

A. An ideal liquid or solid solution is defined as one in which each component obeys Raoult's law

B. If Raoult's law is applied to one component of a binary mixture; Henry's law or Raoult's law is applied to the other component also

C. Henry's law is rigorously correct in the limit of infinite dilution

D. None of these

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4

If the vapour pressure at two temperatures of a solid phase in equilibrium with its liquid phase are known, then the latent heat of fusion can be calculated by the

A. Maxwell's equation

B. Clausius-Clapeyron Equation

C. Van Laar equation

D. Nernst Heat Theorem

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4

Chemical engineering thermodynamics is concerned with the __________ in/of chemical processes.

A. Reaction mechanism

B. Calculation of rates

C. Energy transformation from one form to another

D. None of these

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4

The expression for entropy change, ΔS = n Cp . ln (T2/T1), is valid for the __________ of a substance.

A. Simultaneous pressure & temperature change

B. Heating

C. Cooling

D. Both (B) and (C)

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4

Filling of gas from a high pressure cylinder into small bottles is an example of a/an __________ process.

A. Equilibrium

B. Adiabatic

C. Steady

D. Unsteady

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4

Pick out the correct statement.

A. Like internal energy and enthalpy, the absolute value of standard entropy for elementary substances is zero

B. Melting of ice involves increase in enthalpy and a decrease in randomness

C. The internal energy of an ideal gas depends only on its pressure

D. Maximum work is done under reversible conditions

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4

If the heat of solution of an ideal gas in a liquid is negative, then its solubility at a given partial pressure varies with the temperature as

A. Solubility increases as temperature increases

B. Solubility increases as temperature decreases

C. Solubility is independent of temperature

D. Solubility increases or decreases with temperature depending on the Gibbs free energy change of solution

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4

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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4

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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4

Which of the following identities can be most easily used to verify steam table data for superheated steam?

A. (∂T/∂V)S = (∂p/∂S)V

B. (∂T/∂P)S = (∂V/∂S)P

C. (∂P/∂T)V = (∂S/∂V)T

D. (∂V/∂T)P = -(∂S/∂P)T

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4

The chemical potential of any constituent of an ideal solution depends on the __________ of the solution.

A. Temperature

B. Pressure

C. Composition

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

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4

A closed system is cooled reversibly from 100°C to 50°C. If no work is done on the system

A. its internal energy (U) decreases and its entropy (S) increases

B. U and S both decreases

C. U decreases but S is constant

D. U is constant but S decreases

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4

The melting point of paraffin wax (which contracts on solidification) __________ with pressure rise.

A. Increases

B. Decreases

C. Remains unchanged

D. Decreases linearly

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4

Joule-Thomson effect i.e., a throttling process is a constant __________ process.

A. Entropy

B. Temperature

C. Internal energy

D. Enthalpy

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4

COP of a refrigerator drawing 1 kW of power per ton of refrigeration is about

A. 0.5

B. 3.5

C. 4.5

D. 8.5

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4

Charles' law for gases states that

A. V/T = Constant

B. V ∝ 1/T

C. V ∝ 1/P

D. PV/T = Constant

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4

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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4

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

A. Sublimation

B. Vaporisation

C. Melting

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

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4

Which of the following is an extensive property of a system?

A. Heat capacity

B. Molal heat capacity

C. Pressure

D. Concentration