Chemical Engineering Thermodynamics

481. Which of the following is affected by the temperature?

1. Fugacity
2. Activity co-efficient
3. Free energy
4. All (A), (B) & (C)

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482. Which of the following is an extensive property of a system?

1. Heat capacity
2. Molal heat capacity
3. Pressure
4. Concentration

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483. Which of the following is an undesirable characteristic of a refrigerant?

1. It should be non-explosive
2. It should have a sub-atmospheric vapor pressure at the temperature in refrigerator coils
3. Its vapor pressure at the condenser temperature should be very high
4. None of these

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484. Which of the following is Clausius-Clapeyron Equation for vaporisation of an ideal gas under the condition that the molar volume of liquid is negligible compared to that of the vapor?

1. d ln p/dt = Hvap/RT₂
2. d ln p/dt = RT₂/Hvap
3. dp/dt = RT₂/Hvap
4. dp/dt = Hvap/RT₂

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485. Which of the following is not a common refrigerant?

1. Freon-12
2. Ethylene
3. Ammonia
4. Carbon dioxide

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486. Which of the following is not a reversible process?

1. Expansion of an ideal gas against constant pressure
2. Atmospheric pressure vaporisation of water at 100°C
3. Solution of NaCl in water at 50°C
4. None of these

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487. Which of the following is not a unit of the equilibrium constant Kp? (where, Δx = number of moles of products number of moles of reactants)

1. (atm)^Δx, when Δx is negative
2. (atm)^Δx, when Δx is positive
3. Dimensionless, when Δx = 0
4. (atm)^Δx2, when Δx > 0

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488. Which of the following is not affected by temperature changes?

1. Fugacity
2. Activity co-efficient
3. Free energy
4. None of these

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489. Which of the following is not an equation of state?

1. Bertholet equation
2. Clausius-Clapeyron equation
3. Beattie-Bridgeman equation
4. None of these

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490. Which of the following is not an extensive property?

1. Free energy
2. Entropy
3. Refractive index
4. None of these

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