Related Questions
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Gibbs phase rule finds application, when heat transfer occurs by
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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 case of an __________ process, the temperature of the system increases.
A. Isothermal compression
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The entropy change in a reversible isothermal process, when an ideal gas expands to four times its initial volume is
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Entropy of a substance remains constant during a/an __________ change.
B. Irreversible isothermal
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Requisites of a reversible process is that the
A. System and surroundings pressure be equal
B. Friction in the system should be absent
C. System and surroundings temperature be equal
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Critical compressibility factor for all substances
A. Are more or less constant (vary from 0.2 to 0.3)
B. Vary as square of the absolute temperature
C. Vary as square of the absolute pressure
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All gases except __________ shows a cooling effect during throttling process at atmospheric temperature and pressure.
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Specific volume of an ideal gas is
B. The reciprocal of its density
C. Proportional to pressure
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The activity of an ideal gas is numerically __________ its pressure.
D. Data insufficient, can't be predicted
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The total change in the enthalpy of a system is independent of the
A. Number of intermediate chemical reactions involved
B. Pressure and temperature
C. State of combination and aggregation in the beginning and at the end of the reaction
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The standard state of a gas (at a given temperature) is the state in which fugacity is equal to
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Claude gas liquefaction process employs cooling
C. By expansion in an engine
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If we increase the pressure on a substance (which is at its triple point), then the triple point
D. May increase or decrease; depends on the substance
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Melting of ice exemplifies a/an
D. Process involving a chemical reaction
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Choose the condition that must be specified in order to liquify CO2 (triple point for CO2 is - 57°C and 5.2 atm).
A. Pressure must be kept below 5.2 atm
B. Temperature must be kept above - 57°C
C. Pressure must be kept below 5.2 atm. and temperature must be kept above 57°C
D. Pressure and temperature must be kept below 5.2 atm. and - 57°C respectively
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Trouton's ratio of __________ liquids is calculated using Kistyakowsky equation.
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A solid is transformed into vapour without going to the liquid phase at
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At absolute zero temperature, the __________ of the gas is zero.
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Helmholtz free energy (A) is defined as
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Entropy change for an irreversible process taking system and surrounding together is
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Fugacity of a component in an ideal gas mixture is equal to the partial pressure of that component in the mixture. The fugacity of each component in a stable homogeneous solution at constant pressure and temperature __________ as its mole fraction increases.
B. Decreases exponentially
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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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In case of vapour compression refrigeration system, elevating the evaporator temperature (keeping the condenser temperature constant) results in
C. No change in the value of COP
D. Increased or decreased COP; depending upon the type of refrigerant
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Clausius-Clapeyron equation is applicable to __________ equilibrium processes.
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High __________ is an undesirable property for a good refrigerant.
B. Latent heat of vaporisation
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At equilibrium condition, the chemical potential of a material in different phases in contact with each other is equal. The chemical potential for a real gas (μ) is given by (where, μ = standard chemical potential at unit fugacity (f° = 1 atm.) and the gas behaves ideally.)
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Activity co-efficient is a measure of the
A. Departure from ideal solution behaviour
B. Departure of gas phase from ideal gas law
C. Vapour pressure of liquid
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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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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