Related Questions
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Melting of ice exemplifies a/an
D. Process involving a chemical reaction
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Chemical potential of ith component of a system is given by
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Critical temperature is defined as the temperature above which a gas will
A. Not liquify (barring exceptions)
C. Never liquify however high the pressure may be
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Adiabatic compression of a saturated water vapour makes it
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In case of an __________ process, the temperature of the system increases.
A. Isothermal compression
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Free energy changes for two reaction mechanism 'X' and 'Y are respectively - 15 and - 5 units. It implies that X is
C. Three times slower than Y
D. Three times faster than Y
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4
Which of the following is not an intensive property?
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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
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4
Gibbs free energy of mixing at constant pressure and temperature is always
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If the vapour pressure at two temperatures of a solid phase in equilibrium with its liquid phase are known, then the latent heat of fusion can be calculated by the
B. Clausius-Clapeyron Equation
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The internal energy of an ideal gas does not change in a reversible __________ process.
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Which of the following behaves most closely like an ideal gas?
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Compressibility factor of a gas is
A. Not a function of its pressure
B. Not a function of its nature
C. Not a function of its temperature
D. Unity, if it follows PV = nRT
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4
The efficiency of an Otto engine compared to that of a diesel engine, for the same compression ratio will be
D. Data insufficient to predict
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Which of the following is not correct for a reversible adiabatic process?
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In an ideal gas mixture, fugacity of a species is equal to its
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The temperature at which both liquid and gas phases are identical, is called the __________ point.
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In the reaction, C + O2 → CO2; ΔH = - 94 kcal. What is the heat content (enthalpy) of O2?
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Which law of the thermodynamics provides basis for measuring the thermodynamic property?
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When liquid and vapour phases of one component system are in equilibrium (at a given temperature and pressure), the molar free energy is
C. Same in both the phases
D. Replaced by chemical potential which is more in vapour phase
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The number of degrees of freedom at the triple point of water is
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Lowering of condenser temperature (keeping the evaporator temperature constant) in case of vapour compression refrigeration system results in
D. Increased or decreased COP; depending upon the type of refrigerant
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Boyle's law for gases states that
A. P ∝ 1/V, when temperature is constant
B. P ∝ 1/V, when temperature & mass of the gas remain constant
C. P ∝ V, at constant temperature & mass of the gas
D. P/V = constant, for any gas
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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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As the temperature is lowered towards the absolute zero, the value of the quantity (∂ΔF/∂T) approaches
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The absolute entropy for all crystalline substances at absolute zero temperature 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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4
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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4 kg moles of an ideal gas expands in vacuum spontaneously. The work done is
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In an irreversible process