30351. Fugacity and pressure are numerically not equal for the gases
30352. A solute distributes itself between two non-miscible solvents in contact with each other in such a way that, at a constant temperature, the ratio of its concentrations in two layers is constant, irrespective of its total amount". This is
30353. A solid is transformed into vapour without going to the liquid phase at
30354. A gas mixture of three components is brought in contact with a dispersion of an organic phase in water. The degree of freedom of the system are
30355. 1m3 of an ideal gas at 500 K and 1000 kPa expands reversibly to 5 times its initial volume in an insulated container. If the specific heat capacity (at constant pressure) of the gas is 21 J/mole . K, the final temperature will be
30356. For a thermodynamic system containing 'x' chemical species, the maximum number of phases that can co-exist at equilibrium is
30357. A reasonably general expression for vapour-liquid phase equilibrium at low to moderate pressure is Φi yi P = Yi xi fi° where, Φ is a vapor fugacity component, Yi is the liquid activity co-efficient and fi° is the fugacity of the pure component i. the Ki value (Yi = Ki xi) is therefore, in general a function of
30358. Standard temperature and pressure (S.T.P.) is
30359. Normal temperature and pressure (N.T.P.) corresponds to
30360. The minimum number of phases that can exist in a system is
30361. Enthalpy changes over a constant pressure path are always zero for __________ gas.
30362. 'The fugacity of a gas in a mixture is equal to the product of its mole fraction and its fugacity in the pure state at the total pressure of the mixture". This is
30363. __________ does not change during phase transformation processes like sublimation, melting & vaporisation.
30364. Which one is true for a throttling process ?
30365. Choose the condition that must be specified in order to liquify CO2 (triple point for CO2 is - 57°C and 5.2 atm).
30366. If two pure liquid constituents are mixed in any proportion to give an ideal solution, there is no change in
30367. One mole of nitrogen at 8 bar and 600 K is contained in a piston-cylinder arrangement. It is brought to 1 bar isothermally against a resisting pressure of 1 bar. The work done (in Joules) by the gas is
30368. Lenz's law results from the law of conservation of
30369. In the equation, PVn = constant, if the value of n is in between 1 and y (i.e. Cp/Cv), then it represents a reversible __________ process.
30370. Throttling process is a/an __________ process.
30371. The main feature of Carnot refrigeration cycle is that, it
30372. Heat of reaction at constant volume is identified with __________ change.
30373. Charles' law for gases states that
30374. 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.
30375. Helmholtz free energy (A) is defined as
30376. As pressure approaches zero, the ratio of fugacity to pressure (f/P) for a gas approaches
30377. For any system, what is the minimum number of degrees of freedom?
30378. At 60° C, vapour pressure of methanol and water are 84.562 kPa and 19.953 kPa respectively. An aqueous solution of methanol at 60° C exerts a pressure of 39.223 kPa; the liquid phase and vapour phase mole fractions of methanol are 0.1686 and 0.5714 respectively. Activity co-efficient of methanol is
30379. The variation of heat of reaction with temperature at constant pressure is given by the __________ law.
30380. At absolute zero temperature, the __________ of the gas is zero.
30381. Which of the following equations is used for the prediction of activity co-efficient from experiments ?
30382. The equation, , applicable to a binary solution of components. A and B in equilibrium with their vapors at constant temperature and pressure is called the __________ equation.
30383. Entropy of a substance remains constant during a/an __________ change.
30384. Gases are cooled in Joule-Thomson expansion, when it is __________ inversion temperature.
30385. PVy = constant, holds good for an isentropic process, which is
30386. Which of the following represents the Virial equation of state ?
30387. Which of the following behaves most closely like an ideal gas ?
30388. In the reaction, C + O2 CO2 ; ΔH = - 94 kcal. What is the heat content (enthalpy)of O2?
30389. For a constant volume process __________ by the system is used only to increase the internal energy.
30390. When a system is in equilibrium for all possible processes, the differential or finite change of entropy is
30391. A system is said to be at equilibrium, if the entropy of the system has reached __________ value.
30392. In the equation, PVn = constant, if the value of n = ± ∞, then it represents a reversible __________ process.
30393. Degree of freedom of the system ice-water-vapour will be
30394. A system in which there is exchange of energy but not of mass, is called a/an __________ system.
30395. The point at which all the three (solid, liquid and gas) phases co-exist, is known as the __________ point.
30396. In an ideal gas mixture, fugacity of a species is equal to its
30397. The third law of thermodynamics states that the
30398. Consider the reaction, C + O2 CO2 ;ΔH = - 94 kcal. What will be the value of ΔH for the reaction CO2 C + O2 ?
30399. Which is a state function ?
30400. For an ideal liquid solution, which of the following is unity ?
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