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What is the correct answer?

4

Entropy change for an irreversible process taking system and surrounding together is

A. 0

B. > 0

C. < 0

D. None of these

Correct Answer :

B. > 0


Related Questions

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4

The unit of equilibrium constant of a chemical reaction is the same as that of

A. Molar concentration

B. Temperature

C. Internal energy

D. None of these

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4

Absolute zero temperature signifies the

A. Minimum temperature attainable

B. Temperature of the heat reservoir to which a Carnot engine rejects all the heat that is taken in

C. Temperature of the heat reservoir to which a Carnot engine rejects no heat

D. None of these

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4

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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4

Pick out the wrong statement.

A. At constant pressure, solubility of a gas in a liquid diminishes with rise in temperature

B. Normally, the gases which are easily liquefied are more soluble in common solvents

C. The gases which are capable of forming ions in aqueous solution are much more soluble in water than in other solvents

D. At constant pressure, solubility of a gas in a liquid increases with rise in temperature

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4

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

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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4

Which of the following has the least thermal efficiency?

A. Steam engine

B. Carnot engine

C. Diesel engine

D. Otto engine

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4

Pick out the wrong statement.

A. Activity co-efficient is dimensionless.

B. In case of an ideal gas, the fugacity is equal to its pressure.

C. In a mixture of ideal gases, the fugacity of a component is equal to the partial pressure of the component.

D. The fugacity co-efficient is zero for an ideal gas

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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

The third law of thermodynamics states that the

A. Heat capacity of a crystalline solid is zero at absolute zero temperature

B. Heat transfer from low temperature to high temperature source is not possible without external work

C. Gases having same reduced properties behaves similarly

D. None of these

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4

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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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

As the temperature is lowered towards the absolute zero, the value of ∂(ΔF)/∂T, then approaches

A. Unity

B. Zero

C. That of the heat of reaction

D. Infinity

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4

__________ does not change during phase transformation processes like sublimation, melting & vaporisation.

A. Entropy

B. Gibbs free energy

C. Internal energy

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

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4

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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4

Which of the following is not affected by temperature changes?

A. Fugacity

B. Activity co-efficient

C. Free energy

D. None of these

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4

For the gaseous phase chemical reaction, C2H4(g) + H2O(g) ↔ C2H5OH(g), the equilibrium conversion does not depend on the

A. Steam to ethylene ratio

B. Temperature

C. Pressure

D. None of these

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4

Pick out the extensive property out of the following.

A. Surface tension

B. Free energy

C. Specific heat

D. Refractive index

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4

For a stable phase at constant pressure and temperature, the fugacity of each component in a binary system __________ as its mole fraction increases.

A. Decreases

B. Increases

C. Remain same

D. Decreases linearly

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4

Claude's liquefaction process employs the cooling of gases by

A. Expansion in an engine

B. Following a constant pressure cycle

C. Throttling

D. None of these

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4

What is the degree of freedom for two miscible (non-reacting) substances in vapor-liquid equilibrium forming an azeotrope?

A. 0

B. 1

C. 2

D. 3

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4

The effect of changing the evaporator temperature on COP as compared to that of changing the condenser temperature (in vapour compression refrigeration system) is

A. Less pronounced

B. More pronounced

C. Equal

D. Data insufficient, can't be predicted

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4

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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4

Heat pump

A. Accomplishes only space heating in winter

B. Accomplishes only space cooling in summer

C. Accomplishes both (A) and (B)

D. Works on Carnot cycle

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4

When pressure is applied on the system, ice ↔ water, then

A. Equilibrium cannot be established

B. More ice will be formed

C. More water will be formed

D. Evaporation of water will take place

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4

In the reaction, H2 +I2 2HI, addition of an inert gas will

A. Increase the partial pressure of H2

B. Increase the partial pressure of I2

C. Increase the total pressure and hence shift the equilibrium towards the right

D. Not affect the equilibrium conditions

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4

The expression, nRT ln(P1/P2), is for the __________of an ideal gas.

A. Compressibility

B. Work done under adiabatic condition

C. Work done under isothermal condition

D. Co-efficient of thermal expansion

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4

Lowering of condenser temperature (keeping the evaporator temperature constant) in case of vapour compression refrigeration system results in

A. Increased COP

B. Same COP

C. Decreased COP

D. Increased or decreased COP; depending upon the type of refrigerant

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4

Choose the condition that must be specified in order to liquify CO2 (triple point for CO2 is - 57°C and 5.2 atm).

A. Pressure must be kept below 5.2 atm

B. Temperature must be kept above - 57°C

C. Pressure must be kept below 5.2 atm. and temperature must be kept above 57°C

D. Pressure and temperature must be kept below 5.2 atm. and - 57°C respectively

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4

Pick out the wrong statement.

A. Trouton's ratio of non-polar liquids is calculated using Kistyakowsky equation

B. Thermal efficiency of a Carnot engine is always less than 1

C. An equation relating pressure, volume and temperature of a gas is called ideal gas equation

D. None of these

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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)