### Related Questions

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# Pick out the undesirable property for a good refrigerant.

A. High thermal conductivity

C. Large latent heat of vaporisation

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4

# A/an __________ system is exemplified by a vessel containing a volatile liquid in contact with its vapor.

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4

# For a spontaneous process, free energy

C. Decreases whereas the entropy increases

D. And entropy both decrease

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4

# The enthalpy change when ammonia gas is dissolved in water is called the heat of

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4

# During Joule-Thomson expansion of gases

A. Enthalpy remains constant

B. Entropy remains constant

C. Temperature remains constant

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# For spontaneous changes in an isolated system (S = entropy)

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# Claude's liquefaction process employs the cooling of gases by

A. Expansion in an engine

B. Following a constant pressure cycle

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# __________ calorimeter is normally used for measuring the dryness fraction of steam, when it is very low.

D. A combination of separating & throttling

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# The theoretical minimum work required to separate one mole of a liquid mixture at 1 atm, containing 50 mole % each of n- heptane and noctane into pure compounds each at 1 atm is

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

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# In reactions involving solids and liquids (where change in volume is negligible), the heat of reaction at constant pressure as compared to that at constant volume is

D. Unpredictable; depends on the particular reaction

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# At triple point (for one component system), vapour pressure of solid as compared to that of liquid will be

D. More or less; depending on the system

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# In a working refrigerator, the value of COP is always

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# All gases except __________ shows a cooling effect during throttling process at atmospheric temperature and pressure.

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# A gas performs the maximum work, when it expands

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# Equilibrium constant of a reaction varies with the

A. Initial concentration of the reactant

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# Pick out the wrong statement.

A. The values of (∂P/∂V)_{T} and (∂^{2}P/∂V^{2})_{T} are zero for a real gas at its critical point

B. Heat transferred is equal to the change in the enthalpy of the system, for a constant pressure, non-flow, mechanically reversible process

C. Thermal efficiency of a Carnot engine depends upon the properties of the working fluid besides the source & sink temperatures

D. During a reversible adiabatic process, the entropy of a substance remains constant

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# In case of an __________ process, the temperature of the system increases.

A. Isothermal compression

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# The expression, nC_{v}(T_{2} - T_{1}), is for the __________ of an ideal gas.

A. Work done under adiabatic condition

B. Co-efficient of thermal expansion

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# In an irreversible process

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# An isolated system can exchange __________ with its surroundings.

C. Neither matter nor energy

D. Both matter and energy

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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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# Degrees of freedom at triple point will be

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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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# Pressure-enthalpy chart is useful in refrigeration. The change in internal energy of an ideal fluid used in ideal refrigeration cycle is

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4

# (1/V) (∂V/∂T)_{P} is the mathematical expression

A. Joule-Thomson co-efficient

B. Specific heat at constant pressure (C_{p})

C. co-efficient of thermal expansion

D. Specific heat at constant volume (C_{V})

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# In a reversible process

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# The Joule-Thomson co-efficient is defined as (∂T/∂P)_{H}. Its value at the inversion point is

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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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# Rotary lime kiln is an example of a/an __________ system.