Related Questions
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4
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. CP and CV are state function
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4
In Joule-Thomson porous plug experiment, the
A. Enthalpy does not remain constant
B. Entire apparatus is exposed to surroundings
C. Temperature remains constant
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4
COP of a refrigerator drawing 1 kW of power per ton of refrigeration is about
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4
For a constant pressure reversible process, the enthalpy change (ΔH) of the system is
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4
Which of the following is affected by the temperature?
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4
Fugacity is a measure of the
A. Escaping tendencies of the same substance in different phases of a system
B. Relative volatility of a mixture of two miscible liquids
C. Behaviour of ideal gases
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4
Which of the following is not an intensive property?
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4
(∂H/∂T)P is the mathematical expression for
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4
The first law of thermodynamics is a statement of conservation of
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4
The work done in an adiabatic change in a particular gas depends upon changes in the __________ only.
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4
For a single component two phase mixture, the number of independent variable properties are
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4
First law of thermodynamics deals with the
A. Direction of energy transfer
B. Reversible processes only
C. Irreversible processes only
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If the pressure on 100 c.c. of air is halved, then its volume (at the same temperature) would be __________ c.c.
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The ratio of equilibrium constants (Kp2/Kp1) at two different temperatures is given by
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4
Charles' law for gases states that
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4
Refrigerants commonly used for domestic refrigerators are
A. Ethyl chloride or methyl chloride
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4
The molar excess Gibbs free energy, gE, for a binary liquid mixture at T and P is given by, (gE/RT) = A . x1. x2, where A is a constant. The corresponding equation for ln y1, where y1 is the activity co-efficient of component 1, is
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4
Sound waves propagation in air exemplifies an __________ process.
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Fugacity co-efficient of a substance is the ratio of its fugacity to
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4
No work is done by the system, when a reaction occurs at constant
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4
What is the number of degree of freedom for a system of two miscible non-reacting species in vapor-liquid equilibrium forming an azeotrope?
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4
In a homogeneous solution, the activity coefficient of a component depends upon the
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4
Which of the following has the minimum value of COP for a given refrigeration effect?
B. Ordinary vapour-compression cycle
C. Vapour-compression process with a reversible expansion engine
D. Air refrigeration cycle
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4
Absorption/evolution of heat during conversion of a substance from one allotropic form to another is termed as the heat of
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4
The number of degrees of freedom for an azeotropic mixture in a two component vapour-liquid equilibria is/are
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4
The expression, nCv(T2 - T1), is for the __________ of an ideal gas.
A. Work done under adiabatic condition
B. Co-efficient of thermal expansion
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4
Which of the following is not a reversible process?
A. Expansion of an ideal gas against constant pressure
B. Atmospheric pressure vaporisation of water at 100°C
C. Solution of NaCl in water at 50°C
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4
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:
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4
When a gas is subjected to adiabatic expansion, it gets cooled due to
B. Decrease in temperature
C. Decrease in kinetic energy
D. Energy spent in doing work
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4
Compressibility factor for almost all the gases are approximately same at the same
A. Pressure and temperature
B. Reduced pressure and reduced temperature
C. Critical pressure and critical temperature