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4

The kinetic energy of gas molecule is zero at

A. 0°C

B. 273°C

C. 100°C

D. -273°C

Correct Answer :

D. -273°C


Related Questions

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4

For water at 300°C, it has a vapour pressure 8592.7 kPa and fugacity 6738.9 kPa Under these conditions, one mole of water in liquid phase has a volume of 25.28 cm3 and that in vapour phase in 391.1 cm3.Fugacity of water (in kPa) at 9000 kPa will be

A. 6738.9

B. 6753.5

C. 7058.3

D. 9000

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4

The free energy change for a chemical reaction is given by (where, K = equilibrium constant)

A. RT ln K

B. -RT ln K

C. -R ln K

D. T ln K

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4

Co-efficient of Performance (COP) of a refrigerator is the ratio of the

A. Work required to refrigeration obtained

B. Refrigeration obtained to the work required

C. Lower to higher temperature

D. Higher to lower temperature

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4

Which of the following is not an intensive property?

A. Molar heat capacity

B. Internal energy

C. Viscosity

D. None of these

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4

What is the number of degrees of freedom for liquid water in equilibrium with a mixture of nitrogen and water vapor?

A. 2

B. 0

C. 3

D. 1

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4

Claude gas liquefaction process employs cooling

A. At constant pressure

B. By throttling

C. By expansion in an engine

D. None of these

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4

In vapour compression refrigeration system, if the evaporator temperature and the condenser temperatures are -13°C and 37°C respectively, the Carnot COP will be

A. 5.2

B. 6.2

C. 0.168

D. Data insufficient, can't be found out

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4

The partial pressure of each constituent present in an alloy is __________ the total vapor pressure exerted by the alloy.

A. Less than

B. Equal to

C. More than

D. Either (B) or (C); depends on the type of alloy

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4

What is the value of Joule-Thomson co-efficient for an ideal gas?

A. +ve

B. -ve

C. 0

D.

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4

Keeping the pressure constant, to double the volume of a given mass of an ideal gas at 27°C, the temperature should be raised to __________ °C.

A. 270

B. 327

C. 300

D. 540

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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 a component (μi) of a phase is the amount by which its capacity for doing all work, barring work of expansion is increased per unit amount of substance added for an infinitesimal addition at constant temperature and pressure. It is given by

A. (∂E/∂ni)S, v, nj

B. (∂G/∂ni)T, P, nj = (∂A/∂ni) T, v, nj

C. (∂H/∂ni)S, P, nj

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

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4

What happens in a reversible adiabatic expansion process?

A. Heating takes place

B. Cooling takes place

C. Pressure is constant

D. Temperature is constant

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4

Which of the following is true for Virial equation of state?

A. Virial co-efficients are universal constants

B. Virial co-efficients 'B' represents three body interactions

C. Virial co-efficients are function of temperature only

D. For some gases, Virial equations and ideal gas equations are the same

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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

All gases except __________ shows a cooling effect during throttling process at atmospheric temperature and pressure.

A. Oxygen

B. Nitrogen

C. Air

D. Hydrogen

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4

The ammonia synthesis reaction represented by N2 + 3H2 2NH3; ΔH = - 22.4 kcal, is

A. Endothermic

B. Exothermic

C. Isothermal

D. Adiabatic

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4

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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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

Entropy of the system decreases, when

A. Snow melts into water

B. A gas expands spontaneously from high pressure to low pressure

C. Water is converted into ice

D. Both (B) & (C)

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4

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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4

If the molar heat capacities (Cp or Cv) of the reactants and products of a chemical reaction are identical, then, with the increase in temperature, the heat of reaction will

A. Increase

B. Decrease

C. Remain unaltered

D. Increase or decrease; depends on the particular reaction

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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

Specific volume of an ideal gas is

A. Equal to its density

B. The reciprocal of its density

C. Proportional to pressure

D. None of these

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4

Which is a state function?

A. Specific volume

B. Work

C. Pressure

D. Temperature

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4

The energy of activation of exothermic reaction is

A. Zero

B. Negative

C. Very large compared to that for endothermic reaction

D. Not possible to predict

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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

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 temperature at which both liquid and gas phases are identical, is called the __________ point.

A. Critical

B. Triple

C. Freezing

D. Boiling

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4

For an ideal solution, the value of activity co-efficient is

A. 0

B. 1

C. < 1

D. > 1