Heat is added at constant pressure in an ideal __________ cycle.
A reasonably general expression for vapourliquid phase equilibrium at low to moderate pressure is φi yi P = Yi xifi° where, Φ is a vapor fugacity component, Yi is the liquid activity co-efficient and fi° is the fugacity of the pure component i. the Ki value (Yi = Ki xi) is therefore, in general a function of
Temperature and pressure only
Temperature, pressure and liquid composition x
i and vapour composition yi
Temperature, pressure, liquid composition x
The reaction A (l) → R(g) is allowed to reach equilibrium conditions in an autoclave. At equilibrium, there are two phases, one a pure liquid phase of A and the other a vapor phase of A, R and S. Initially A alone is present. The numbers of degrees of freedom are:
Chemical engineering thermodynamics is concerned with the __________ in/of chemical processes.
Energy transformation from one form to another
Pick out the wrong statement.
Trouton's ratio of non-polar liquids is calculated using Kistyakowsky equation
Thermal efficiency of a Carnot engine is always less than 1
An equation relating pressure, volume and temperature of a gas is called ideal gas equation
The number of degrees of freedom for a mixture of ice and water (liquid) are
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
i)T, P, nj = (∂A/∂ni) T, v, nj
For an ideal liquid solution, which of the following is unity?
The relation connecting the fugacities of various components in a solution with one another and to composition at constant temperature and pressure is called the __________ equation.
All gases during throttling process at atmospheric temperature and pressure show a cooling effect except
The change in __________ is equal to the reversible work for compression in steady state flow process under isothermal condition.
Henry's law is closely obeyed by a gas, when its __________ is extremely high.
Throttling (Joule-Thomson effect) process is a constant __________ process.
For an irreversible process involving only pressure-volume work
Gibbs phase rule finds application, when heat transfer occurs by
Critical compressibility factor for all substances
Are more or less constant (vary from 0.2 to 0.3)
Vary as square of the absolute temperature
Vary as square of the absolute 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 ratio of chemical potential to free energy of a pure substance at constant temperature and pressure is
In any spontaneous process, the __________ free energy decreases.
Co-efficient of Performance (COP) of a refrigerator is the ratio of the
Work required to refrigeration obtained
Refrigeration obtained to the work required
Lower to higher temperature
Higher to lower temperature
For an ideal gas, the enthalpy
Increases with rise in pressure
Decreases with rise in pressure
Is independent of pressure
Reduced pressure of a gas is the ratio of its
Pressure to critical pressure
Critical pressure to pressure
Pressure to pseudocritical pressure
Pseudocritical pressure to pressure
In case of a close thermodynamic system, there is __________ across the boundaries.
No heat and mass transfer
No mass transfer but heat transfer
The number of degree of freedom for an Azeotropic mixture of ethanol and water in vapourliquid equilibrium, is
In a P-V diagram (for an ideal gas), an isothermal curve will coincide within adiabatic curve (through a point), when
On a P-V diagram of an ideal gas, suppose a reversible adiabatic line intersects a reversible isothermal line at point A. Then at a point A, the slope of the reversible adiabatic line (∂P/∂V)s and the slope of the reversible isothermal line (∂P/ ∂V)T are related as (where, y = Cp/Cv)
High pressure steam is expanded adiabatically 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:
The expression for entropy change given by, ΔS = nR ln (V2/V1) + nCv ln (T2/T1) is valid for
Reversible isothermal volume change
Simultaneous heating and expansion of an ideal gas
The partial molar enthalpy of a component in an ideal binary gas mixture of composition Z, at a temperature T and pressure P, is a function only of
The efficiency of an Otto engine compared to that of a diesel engine, for the same compression ratio will be
Data insufficient to predict
Free energy changes for two reaction mechanism 'X' and 'Y are respectively - 15 and - 5 units. It implies that X is
Three times slower than Y
Three times faster than Y