Chemical Engineering Thermodynamics

61. As the entropy of the universe is increasing, day by day, the work producing capacity of a heat engine is

1. Not changed
2. Decreasing
3. Increasing
4. Data sufficient, can't be predicted

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62. As the temperature is lowered towards the absolute zero, the value of ∂(ΔF)/∂T, then approaches

1. Unity
2. Zero
3. That of the heat of reaction
4. Infinity

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63. As the temperature is lowered towards the absolute zero, the value of the quantity (∂ΔF/∂T) approaches

1. Zero
2. Unity
3. Infinity
4. None of these

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64. As the time is passing, entropy of the universe

1. Is increasing
2. Is decreasing
3. Remain constant
4. Data insufficient, can't be predicted

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65. At _________ point, all the three phases (i.e. solid, liquid and gas) co-exist.

1. Eutectic
2. Triple
3. Plait
4. Critical

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66. 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

1. 1.572
2. 1.9398
3. 3.389
4. 4.238

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67. At a given temperature, the volume of a gas dissolved in a solvent _________ with increase in pressure.

1. Increases
2. Decreases
3. Remains unchanged
4. May increase or decrease; depends on the gas

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68. At absolute zero temperature, the _________ of the gas is zero.

1. Pressure
2. Volume
3. Mass
4. None of these

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69. At constant temperature and pressure, for one mole of a pure substance, the ratio of the free energy to the chemical potential is

1. Zero
2. One
3. Infinity
4. Negative

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70. 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.)

1. μ° + RT ln ƒ
2. μ°+ R ln ƒ
3. μ° + T ln ƒ
4. μ° + R/T ln ƒ

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