Related Questions
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As the time is passing, entropy of the universe
D. Data insufficient, can't be predicted
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At the critical point of a substance
A. The surface tension vanishes
B. Liquid and vapour have the same density
C. There is no distinction between liquid and vapour phases
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__________ Equation predicts the activity coefficient from experimental data.
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Enthalpy of a gas depends upon its
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Critical compressibility factor for all substances
A. Are more or less constant (vary from 0.2 to 0.3)
B. Vary as square of the absolute temperature
C. Vary as square of the absolute pressure
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The compressibility factor for an ideal gas is 1. Its value for any other real gas is
D. Either (B) or (C), depends on the nature of the gas
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Entropy is a measure of the __________ of a system.
C. Temperature changes only
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Boiling of liquid is accompanied with increase in the
B. Specific Gibbs free energy
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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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Which of the following is not an equation of state?
B. Clausius-Clapeyron equation
C. Beattie-Bridgeman equation
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When a gas is expanded from high pressure region to low pressure region; temperature change occurs. This phenomenon is related to the
B. Gibbs-Helmholtz equation
C. Third law of thermodynamics
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Dryness fraction of wet steam is defined as the ratio of mass of vapour in the mixture to the mass of mixture __________ calorimeter is not used for measuring the dryness fraction of steam.
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Free energy change at equilibrium is
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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
B. (∂G/∂ni)T, P, nj = (∂A/∂ni) T, v, nj
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Measurement of thermodynamic property of temperature is facilitated by __________ law of thermodynamics.
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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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For an incompressible fluid, the __________ is a function of both pressure as well as temperature.
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When a system is in equilibrium for all possible processes, the differential or finite change of entropy is
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Critical solution temperature (or the consolute temperature) for partially miscible liquids (e.g., phenol-water) is the minimum temperature at which
A. A homogeneous solution (say of phenol water) is formed
B. Mutual solubility of the two liquids shows a decreasing trend
C. Two liquids are completely separated into two layers
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In which of the following reaction equilibrium, the value of equilibrium constant Kp will be more than is Kc?
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For an ideal gas, the enthalpy
A. Increases with rise in pressure
B. Decreases with rise in pressure
C. Is independent of pressure
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Vapour which is at a pressure smaller than the saturation pressure for the temperature involved is called a __________ vapour.
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In vapour compression refrigeration system, if the evaporator temperature and the condenser temperatures are -13°C and 37°C respectively, the Carnot COP will be
D. Data insufficient, can't be found out
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The chemical potential for a pure substance is __________ its partial molal free energy.
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As the temperature is lowered towards the absolute zero, the value of ∂(ΔF)/∂T, then approaches
C. That of the heat of reaction
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For a reversible process involving only pressure-volume work
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Heat evolved/absorbed during conversion of a substance from one allotropic form to another is termed as the heat of
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For equilibrium process (i.e. reversible) in an isolated system
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At absolute zero temperature, the __________ of the gas is zero.
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Choose the condition that must be specified in order to liquify CO2 (triple point for CO2 is - 57°C and 5.2 atm).
A. Pressure must be kept below 5.2 atm
B. Temperature must be kept above - 57°C
C. Pressure must be kept below 5.2 atm. and temperature must be kept above 57°C
D. Pressure and temperature must be kept below 5.2 atm. and - 57°C respectively