### Related Questions

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# Pick out the correct statement.

A. A real gas on expansion in vacuum gets heated up

B. An ideal gas on expansion in vacuum gets cooled

C. An ideal gas on expansion in vacuum gets heated up

D. A real gas on expansion in vacuum cools down whereas ideal gas remains unaffected

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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

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# For a constant pressure reversible process, the enthalpy change (ΔH) of the system is

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# What is the ratio of adiabatic compressibility to isothermal compressibility?

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

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# Internal energy is equal to the heat absorbed in case of a/an __________ process.

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# Number of phases in a colloidal system is:

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# A cylinder contains 640 gm of liquid oxygen. The volume occupied (in litres) by the oxygen, when it is released and brought to standard conditions (0°C, 760 mm Hg) will be __________ litres.

D. Data insufficient; can't be computed

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# Isobaric process means a constant process.

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# Work done is a

A. Property of the system

D. State description of a system

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# Which of the following is not an extensive property?

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# Entropy of an ideal gas depends upon its

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

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# The Maxwell relation derived from the differential expression for the Helmholtz free energy (dA) is

A. (∂T/∂V)_{S} = - (∂P/∂S)_{V}

B. (∂S/∂P)_{T} = - (∂V/∂T)_{P}

C. (∂V/∂S)_{P} = (∂T/∂P)_{S}

D. (∂S/∂V)_{T} = (∂P/∂T)_{V}

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# __________ law of thermodynamics ascertains the direction of a particular spontaneous process.

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# Pick out the extensive property out of the following.

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# The expression, nRT ln(P_{1}/P_{2}), is for the __________of an ideal gas.

B. Work done under adiabatic condition

C. Work done under isothermal condition

D. Co-efficient of thermal expansion

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# Heat requirement for decomposition of a compound into its elements is __________ that is evolved during the formation of that compound from its elements.

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# Joule-Thomson co-efficient for a perfect gas is

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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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# Steam undergoes isentropic expansion in a turbine from 5000 kPa and 400°C (entropy = 6.65 kJ/kg K) to 150 kPa) (entropy of saturated liquid = 1.4336 kJ/kg. K, entropy of saturated vapour = 7.2234 kJ/kg. K) The exit condition of steam is

B. Partially condensed vapour with quality of 0.9

D. Partially condensed vapour with quality of 0.1

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# Clapeyron Equation deals with the

A. Rate of change of vapour pressure with temperature

B. Effect of an inert gas on vapour pressure

C. Calculation of ΔF for spontaneous phase change

D. Temperature dependence of heat of phase transition

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# Entropy, which is a measure of the disorder of a system, is:

A. Independent of pressure

B. Independent of temperature

C. Zero at absolute zero temperature for a perfect crystalline substance

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# Which of the following will increase the volume of a real gas by four times?

A. Doubling the absolute temperature as well as pressure of the gas

B. Reducing pressure to one fourth at constant temperature

C. Reducing temperature to one fourth at constant pressure

D. Reducing the temperature to half and doubling the pressure

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# Enthalpy of a gas depends upon its

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# Which of the following is Virial equation of state?

A. (p + a/V^{2})(V - b) = nRT

C. PV = A + B/V + C/V^{2} + D/V^{3} + ...

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# The free energy change for a chemical reaction is given by (where, K = equilibrium constant)

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# If heat contents of CH_{4}, C_{2}H_{4} and C_{3}H_{8} are -17.9, 12.5 and -24.8 kcal/mole respectively, than ΔH for the reaction CH_{4}(g) + C_{2}H_{4}(g) C_{3}H_{8}(g) will be __________ Kcal.

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# Entropy change for an irreversible process taking system and surrounding together is

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# For an ideal liquid solution, which of the following is unity?