A refrigerator works on the principle of __________ law of thermodynamics.
'The fugacity of a gas in a mixture is equal to the product of its mole fraction and its fugacity in the pure state at the total pressure of the mixture". This is
One mole of nitrogen at 8 bar andK is contained in a piston-cylinder arrangement. It is brought to 1 bar isothermally against a resisting pressure of 1 bar. The work done (in Joules) by the gas is
Claude's liquefaction process employs the cooling of gases by
Melting of ice is an example of an __________ process.
There is a change in __________ during the phase transition.
Second law of thermodynamics is concerned with the
Fugacity co-efficient of a substance is the ratio of its fugacity to
Which of the following identities can be most easily used to verify steam table data for superheated steam.
High pressure steam is expanded adiabati-cally and reversibly through a well insulated turbine, which produces some shaft work. If the enthalpy change and entropy change across the turbine are represented by ΔH and ΔS respectively for this process:
Standard temperature and pressure (S.T.P.) is
A solid is transformed into vapour without going to the liquid phase at
What is the degree of freedom for a system comprising liquid water equilibrium with its vapour ?
Pick out the wrong statement.
__________ does not change during phase transformation processes like sublimation, melting & vaporisation.
For a constant pressure reversible process, the enthalpy change (ΔH) of the system is
Lenz's law results from the law of conservation of
In the ammonia synthesis reaction, N2 + 3H2 2NH3 + 22.4 kcal, the formation of NH3 will be favoured by
At triple point (for one component system), vapour pressure of solid as compared to that of liquid will be
The effect of changing the evaporator temperature on COP as compared to that of changing the condenser temperature (in vapour compression refrigeration system) is
The chemical potential for a pure substance is __________ its partial molal free energy.
Gibbs free energy (F) is defined as
The internal energy of an incompressible fluid depends upon its
The expression for entropy change given by, ΔS = nR ln (V2/V1) + nCv ln (T2/T1) is valid for
Which of the following is true for Virial equation of state ?
Gases are cooled in Joule-Thomson expansion, when it is __________ inversion temperature.
The molar excess Gibbs free energy, gE, for a binary liquid mixture at T and P is given by, (gE/RT) = A . x1. x2, where A is a constant. The corresponding equation for ln y1, where y1 is the activity co-efficient of componentis
The necessary condition for phase equilibrium in a multiphase system of N components is that the
Normal temperature and pressure (N.T.P.) corresponds to
A gas mixture of three components is brought in contact with a dispersion of an organic phase in water. The degree of freedom of the system are
Which one is true for a throttling process ?
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
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.