Chemical Engineering Thermodynamics

391. The melting point of paraffin wax (which contracts on solidification) _________ with pressure rise.

1. Increases
2. Decreases
3. Remains unchanged
4. Decreases linearly

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392. The minimum number of phases that can exist in a system is

1. 0
2. 1
3. 2
4. 3

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393. The molar excess Gibbs free energy, g^E, for a binary liquid mixture at T and P is given by, (g^E/RT) = A . x₁. x₂, where A is a constant. The corresponding equation for ln y₁, where y₁ is the activity co-efficient of component 1, is

1. A . x₂ ²
2. Ax₁
3. Ax₂
4. Ax₁ ²

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394. The most important application of distribution law is in

1. Evaporation
2. Liquid extraction
3. Drying
4. Distillation

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395. The necessary and sufficient condition for equilibrium between two phases is

1. The concentration of each component should be same in the two phases
2. The temperature of each phase should be same
3. The pressure should be same in the two phases
4. The chemical potential of each component should be same in the two phases

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396. The necessary condition for phase equilibrium in a multiphase system of N components is that the

1. Chemical potentials of a given component should be equal in all phases
2. Chemical potentials of all components should be same in a particular phase
3. Sum of the chemical potentials of any given component in all the phases should be the same
4. None of these

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397. The number of degree of freedom for an Azeotropic mixture of ethanol and water in vapourliquid equilibrium, is

1. 3
2. 1
3. 2
4. 0

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398. The number of degrees of freedom at the triple point of water is

1. 0
2. 1
3. 2
4. 3

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399. The number of degrees of freedom for a mixture of ice and water (liquid) are

1. 3
2. 2
3. 1
4. 0

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400. The number of degrees of freedom for an azeotropic mixture in a two component vapourliquid equilibria is/are

1. Zero
2. One
3. Two
4. Three

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