Related Questions
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If two gases have same reduced temperature and reduced pressure, then they will have the same
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Degree of freedom of the system ice-watervapour will be
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There is a change in __________ during the phase transition.
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After throttling, gas temperature
D. May increase or decrease; depends on the nature of the gas
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If heat contents of CH4, C2H4 and C3H8 are -17.9, 12.5 and -24.8 kcal/mole respectively, than ΔH for the reaction CH4(g) + C2H4(g) C3H8(g) will be __________ Kcal.
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If the molar heat capacities (Cp or Cv) of the reactants and products of a chemical reaction are identical, then, with the increase in temperature, the heat of reaction will
D. Increase or decrease; depends on the particular reaction
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When a gas in a vessel expands, its internal energy decreases. The process involved is
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Chemical engineering thermodynamics is concerned with the __________ in/of chemical processes.
C. Energy transformation from one form to another
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Throttling (Joule-Thomson effect) process is a constant __________ process.
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Dry ice is
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Which is a state function?
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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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The unit of equilibrium constant of a chemical reaction is the same as that of
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Extensive properties of a thermodynamic system depend upon the __________ of the system.
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Entropy of the system decreases, when
B. A gas expands spontaneously from high pressure to low pressure
C. Water is converted into ice
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For an isothermal reversible compression of an ideal gas
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(∂E/∂T)V is the mathematical expression for
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Enthalpy 'H' is defined as
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The rate at which a substance reacts is proportional to its active mass and the rate of a chemical reaction is proportional to the product of active masses of the reacting substances. This is the
B. Statement of Van't Hoff Equation
C. Le-Chatelier's principle
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4
The equation, PV = nRT, is best obeyed by gases at
A. Low pressure & high temperature
B. High pressure & low temperature
C. Low pressure & low temperature
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Pick out the wrong statement.
A. At constant pressure, solubility of a gas in a liquid diminishes with rise in temperature
B. Normally, the gases which are easily liquefied are more soluble in common solvents
C. The gases which are capable of forming ions in aqueous solution are much more soluble in water than in other solvents
D. At constant pressure, solubility of a gas in a liquid increases with rise in temperature
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Third law of thermodynamics is helpful in
A. Prediction of the extent of a chemical reaction
B. Calculating absolute entropies of substances at different temperature
C. Evaluating entropy changes of chemical reaction
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Work done in an adiabatic process between two states depends on the
A. Rate of heat transmission
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(1/V) (∂V/∂T)P is the mathematical expression
A. Joule-Thomson co-efficient
B. Specific heat at constant pressure (Cp)
C. co-efficient of thermal expansion
D. Specific heat at constant volume (CV)
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The expression for the work done for a reversible polytropic process can be used to obtain the expression for work done for all processes, except reversible __________ process.
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Co-efficient of Performance (COP) of a refrigerator is the ratio of the
A. Work required to refrigeration obtained
B. Refrigeration obtained to the work required
C. Lower to higher temperature
D. Higher to lower temperature
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For a cyclic process, a fixed ratio between heat and work
D. Is difficult to predict
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The co-efficient of performance (COP) of a refrigerating system, which is its index of performance, is defined as the ratio of useful refrigeration to the net work. The units of __________ and COP are the same.
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Which of the following has the least thermal efficiency?
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In case of a reversible process (following pvn = constant), work obtained for trebling the volume (v1 = 1 m3 and v23 m3) is maximum, when the value of 'n' is