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
A. 35 K
B. 174 K
C. 274 K
D. 154 K
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When pressure is applied on the system, ice ⟷ water, then
A. Equilibrium can not be established
B. More ice will be formed
C. More water will be formed
D. Evaporation of water will take place
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If different processes are used to bring about the same chemical reaction, the enthalpy change is same for all of them. This is __________ law.
A. Hess's
B. Kirchoff's
C. Lavoisier and Laplace
D. None of these
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If atmospheric temperature and dew point are nearly equal, then the relative humidity is
A. Zero
B. 50%
C. Almost 100%
D. Unpredictable
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First law of thermodynamics deals with the
A. Direction of energy transfer
B. Reversible processes only
C. Irreversible processes only
D. None of these
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In reactions involving solids and liquids (where change in volume is negligible), the heat of reaction at constant pressure as compared to that at constant volume is
A. More
B. Less
C. Same
D. Unpredictable; depends on the particular reaction
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COP of a refrigerator drawing 1 kW of power per ton of refrigeration is about
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The number of degree of freedom for an azeotropic mixture of ethanol and water in vapour-liquid equilibrium, is
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Gibbs free energy of a pure fluid approaches __________ as the pressure tends to zero at constant temperature.
A. Infinity
B. Minus infinity
C. Zero
D. None of these
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Out of the following refrigration cycles, which one has the minimum COP (Co-efficient of performance)?
A. Air cycle
B. Carnot cycle
C. Ordinary vapour compression cycle
D. Vapour compression with a reversible expansion engine
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At absolute zero temperature, all substances have the same
A. Heat capacity
B. Crystalline structure
C. Entropy
D. None of these
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The expression, Δ G = nRT . l n P 1 P 2 ,
A. With pressure changes at constant temperature
B. Under reversible isothermal volume change
C. During heating of an ideal gas
D. During cooling of an ideal gas
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The thermodynamic law, PVY = constant, is not applicable in case of
A. Ideal compression of air
B. Free expansion of an ideal gas
C. Adiabatic expansion of steam in a turbine
D. Adiabatic compression of a perfect gas
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Entropy change of the reaction, H2 O(liquid) ⇒ H2 O(gas), is termed as the enthalpy of
A. Solution
B. Vaporisation
C. Formation
D. None of the above
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Specific __________ does not change during a phase change (e.g. sublimation, melting, vaporisation etc.).
A. Entropy
B. Internal energy
C. Enthalpy
D. Gibbs free energy
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For an ideal gas, the activity co-efficient is
A. Directly proportional to pressure
B. Inversely proportional to pressure
C. Unity at all pressures
D. None of these
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For an isothermal process, the internal energy of a gas
A. Increases
B. Decreases
C. Remains unchanged
D. Data insufficient, can't be predicted
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If two gases have same reduced temperature and reduced pressure, then they will have the same
A. Volume
B. Mass
C. Critical temperature
D. None of these
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Gibbs phase rule finds application, when heat transfer occurs by
A. Conduction
B. Convection
C. Radiation
D. Condensation
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There is a change in __________ during the phase transition.
A. Volume
B. Pressure
C. Temperature
D. All of the above
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