Related Questions
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In an irreversible process
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In a P-V diagram (for an ideal gas), an isothermal curve will coincide within adiabatic curve (through a point), when
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4
Pick out the undesirable property for a good refrigerant.
A. High thermal conductivity
C. Large latent heat of vaporisation
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4
For organic compounds, group contribution method can be used for the estimation of
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4
The unity of Planck's constant 'h' in the equation, E = hv is
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4
When a system is in equilibrium for all possible processes, the differential or finite change of entropy is
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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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4
During Joule-Thomson expansion of gases
A. Enthalpy remains constant
B. Entropy remains constant
C. Temperature remains constant
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In a working refrigerator, the value of COP is always
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For the reversible exothermic reaction, N2 + 3H2 2NH3, increase of pressure would
A. Shift the equilibrium towards right
B. Give higher yield of NH3
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The efficiency of a Carnot heat engine operating between absolute temperatures T1 and T2 (when, T1 > T2) is given by (T1 - T2)/T1. The co-efficient of performance (C.O.P.) of a Carnot heat pump operating between T1 and T2 is given by
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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
Pick out the correct statement:
A. In an isothermal system, irreversible work is more than reversible work
B. Under reversible conditions, the adiabatic work is less than isothermal work
C. Heat, work, enthalpy and entropy are all 'state functions'
D. Matter and energy cannot be exchanged with the surroundings in a closed system
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4
Refrigerants commonly used for domestic refrigerators are
A. Ethyl chloride or methyl chloride
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Compressibility factor-reduced pressure plot on reduced co-ordinates facilitates
A. Use of only one graph for all gases
B. Covering of wide range
D. More accurate plotting
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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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What is the degree of freedom for two miscible (non-reacting) substances in vapor-liquid equilibrium forming an azeotrope?
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Maxwell's relation corresponding to the identity, dH = dS = Vdp + Σμi dni is
A. (∂T/∂V)S, ni = -(∂P/∂S)V, ni
B. (∂S/∂P)T, ni = (∂V/∂T)P, ni
C. (∂S/∂V)T, ni = (∂P/∂T)V, ni
D. (∂T/∂P)S, ni = (∂V/∂S)P, ni
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Solubility of a substance which dissolves with an increase in volume and liberation of heat will be favoured by the
A. Low pressure and high temperature
B. Low pressure and low temperature
C. High pressure and low temperature
D. High pressure and high temperature
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The internal energy of an incompressible fluid depends upon its
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Which of the following behaves most closely like an ideal gas?
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High __________ is an undesirable property for a good refrigerant.
B. Latent heat of vaporisation
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In a homogeneous solution, the fugacity of a component depends upon the
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Which of the following is not an extensive property?
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For a cyclic process, a fixed ratio between heat and work
D. Is difficult to predict
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For a constant volume process __________ by the system is used only to increase the internal energy.
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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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Consider the reaction, C + O2 CO2; ΔH = - 94 kcal. What will be the value of ΔH for the reaction CO2 → C + O2?
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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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As the time is passing, entropy of the universe
D. Data insufficient, can't be predicted