Which of the following behaves most closely like an ideal gas ?
The point at which all the three (solid, liquid and gas) phases co-exist, is known as the __________ point.
In an ideal gas mixture, fugacity of a species is equal to its
Trouton's ratio is given by (where λb, = molal heat of vaporisation of a substance at its normal boiling point, kcal/kmol Tb = normal boiling point, °K )
What is the degree of freedom for a system comprising liquid water equilibrium with its vapour ?
At absolute zero temperature, the __________ of the gas is zero.
Melting of wax is accompanied with __________ in entropy.
Helmholtz free energy (A) is defined as
As pressure approaches zero, the ratio of fugacity to pressure (f/P) for a gas approaches
Lenz's law results from the law of conservation of
For a constant volume process __________ by the system is used only to increase the internal energy.
When a system is in equilibrium for all possible processes, the differential or finite change of entropy is
Which of the following equations is used for the prediction of activity co-efficient from experiments ?
For spontaneous changes in an isolated system (S = entropy)
First law of thermodynamics deals with the
Work done in case of free expansion is
For any system, what is the minimum number of degrees of freedom?
A system is said to be at equilibrium, if the entropy of the system has reached __________ value.
At a given temperature, the volume of a gas dissolved in a solvent __________ with increase in pressure.
Chemical potential (an intensive property) of a substance is a force that drives the chemical system to equilibrium and is equal to its partial molar properties. The reatio of chemical potential to free energy of a pure substance at oconstant temperature and pressure is
AtC, vapour pressure of methanol and water are 84.kPa and 19.kPa respectively. An aqueous solution of methanol atC exerts a pressure of 39.kPa; the liquid phase and vapour phase mole fractions of methanol are 0.and 0.respectively. Activity co-efficient of methanol is
In the equation, PVn = constant, if the value of n = ± ∞, then it represents a reversible __________ process.
Third law of thermodynamics is helpful in
Entropy of a substance remains constant during a/an __________ change.
Entropy change in case of reversible adiabatic process is
Which is an example of closed system ?
Heat evolved/absorbed during conversion of a substance from one allotropic form to another is termed as the heat of
Compressibility factor-reduced pressure plot on reduced co-ordinates facilitates
During adiabatic expansion of gas
Fugacity and pressure are numerically equal, when the gas is
Which of the following has the minimum value of COP for a given refrigeration effect?
In reactions involving solids and liquids (where change in volume is negligible), the heat of reaction at constant pressure as compared to that at constant volume is
What happens in a reversible adiabatic compression ?
Which of the following is not an intensive property ?
Refrigerants commonly used for domestic refrigerators are
__________ decreases during adiabatic throttling of a perfect gas.
Efficiency of a Carnot engine working between temperatures T1 and T2 (T1 < T) is
For multicomponent multiple phases to be in equilibrium at the same pressure and temperature, the __________ of each component must be same in all phases.
The work done in isothermal compression compared to that in adiabatic compression will be
Ideal gas law is applicable at
Sublimation temperature of dry ice (solid CO2) is __________ °C.
Pick out the wrong statement.
Solid and liquid phases of a substance are in equilibrium at the
Absolute zero temperature signifies the