Which of the following equations is obtained on combining 1st and 2nd law of thermodynamics, for a system of constant mass?
Molar heat capacity of water in equilibrium with ice at constant pressure is __________ Kcal/kg mole . °K
In case of an __________ process, the temperature of the system increases.
PVy = constant, holds good for an isentropic process, which is
The adiabatic throttling process of a perfect gas is one of constant enthalpy
Pressure-enthalpy chart is useful in refrigeration. The change in internal energy of an ideal fluid used in ideal refrigeration cycle is
Degree of freedom of the system ice-water-vapour will be
What happens in a reversible adiabatic expansion process ?
A gas can be liquified by pressure alone only, when its temperature is __________ its critical temperature.
Thermal efficiency of a Carnot engine can approach 100%, only when the temperature of the
The standard state of a gas (at a given temperature) is the state in which fugacity is equal to
Fugacity co-efficient of a substance is the ratio of its fugacity to
For spontaneous changes in an isolated system (S = entropy)
First law of thermodynamics deals with the
A system in which there is exchange of energy but not of mass, is called a/an __________ system.
For an ideal gas, the internal energy depends upon its __________ only.
Cp of a gas at its critical temperature and pressure
The variation of heat of reaction with temperature at constant pressure is given by the __________ law.
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
As pressure approaches zero, the ratio of fugacity to pressure (f/P) for a gas approaches
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)
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 )
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
Which of the following behaves most closely like an ideal gas ?
During adiabatic expansion of gas