### Related Questions

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# Free energy

A. Decreases in all spontaneous (or irreversible) processes

B. Change during a spontaneous process has a negative value

C. Remains unchanged in reversible processes carried at constant temperature and pressure

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# Domestic refrigerator usually works on the __________ refrigeration cycle.

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# At absolute zero temperature, the __________ of the gas is zero.

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# Pick out the wrong statement

A. Phase rule variables are intensive properties

B. Heat and work are both state function

C. The work done by expansion of a gas in vacuum is zero

D. C_{P} and C_{V} are state function

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# The shape of T-S diagram for Carnot Cycle is a

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# Which of the following liquid metals has the highest thermal conductivity?

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# (∂E/∂T)_{V} is the mathematical expression for

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# For a constant volume process

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# To obtain integrated form of Clausius-Clapeyron equation, ln (P_{2}/P_{1}) = (ΔH_{V}/R) (1/T_{1} - 1/T_{2}) from the exact Clapeyron equation, it is assumed that the

A. Volume of the liquid phase is negligible compared to that of vapour phase

B. Vapour phase behaves as an ideal gas

C. Heat of vaporisation is independent of temperature

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# A closed system is cooled reversibly from 100°C to 50°C. If no work is done on the system

A. its internal energy (U) decreases and its entropy (S) increases

B. U and S both decreases

C. U decreases but S is constant

D. U is constant but S decreases

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# A thermodynamic system is taken from state A to B along ACB and is brought back to A along BDA as shown below in the P-V diagram. The net work done during the complete cycle is given by the area covered by

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# Joule-Thomson Co-efficient at any point on the inversion curve is

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# First law of thermodynamics deals with the

A. Direction of energy transfer

B. Reversible processes only

C. Irreversible processes only

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# In the equation, PV^{n} = constant, if the value of n = 1, then it represents a reversible __________ process.

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# Which is not constant for an ideal gas?

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# Gibbs-Helmholtz equation is

A. ΔF = ΔH + T [∂(ΔF)/∂T]P

D. dP/dT = ΔH_{vap}/T.ΔV_{vap}

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# The intensive properties are

A. Molar volume, density, viscosity and boiling point

B. Refractive index and surface tension

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# A refrigeration cycle is the same as a __________ cycle,

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# Work done in an adiabatic process between two states depends on the

A. Rate of heat transmission

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# The minimum number of phases that can exist in a system is

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# Third law of thermodynamics is helpful in

A. Prediction of the extent of a chemical reaction

B. Calculating absolute entropies of substances at different temperature

C. Evaluating entropy changes of chemical reaction

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# The ratio of equilibrium constants (Kp2/Kp1) at two different temperatures is given by

A. (R/ΔH) (1/T_{1} - 1/T_{2})

B. (ΔH/R) (1/T_{1} - 1/T_{2})

C. (ΔH/R) (1/T_{2} - 1/T_{1})

D. (1/R) (1/T_{1} - 1/T_{2})

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# For a stable phase at constant pressure and temperature, the fugacity of each component in a binary system __________ as its mole fraction increases.

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# For a spontaneous process, free energy

C. Decreases whereas the entropy increases

D. And entropy both decrease

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# Joule-Thomson experiment is

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# All gases above its inversion temperature, in a throttling process will show

B. No change in temperature

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# Chemical potential is a/an

C. Force which drives the chemical system to equilibrium

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# Air enters an adiabatic compressor at 300K. The exit temperature for a compression ratio of 3, assuming air to be an ideal gas (Y = C_{p}/C_{v} = 7/5) and the process to be reversible, is

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# A system is said to be at equilibrium, if the entropy of the system has reached __________ value.

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# An ideal gas is taken around the cycle ABCA as shown in P-V diagram below: The work done by the gas during the cycle is equal to