Chemical Engineering Thermodynamics

341. The ammonia synthesis reaction represented by N₂ + 3H₂ ⇌ 2NH3; ΔH = - 22.4 kcal, is

1. Endothermic
2. Exothermic
3. Isothermal
4. Adiabatic

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342. The amount of heat required to decompose a compound into its elements is _________ the heat of formation of that compound from its elements.

1. Less than
2. More than
3. Same as
4. Not related to

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343. The Carnot co-efficient of performance (COP) of a domestic air conditioner compared to a household refrigerator is

1. Less
2. More
3. Same
4. Dependent on climatic conditions

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344. The change in _________ is equal to the reversible work for compression in steady state flow process under isothermal condition.

1. Internal energy
2. Enthalpy
3. Gibbs free energy
4. Helmholtz free energy

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345. The change in Gibbs free energy for vaporisation of a pure substance is

1. Positive
2. Negative
3. Zero
4. May be positive or negative

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346. The chemical potential for a pure substance is _________ its partial molal free energy.

1. More than
2. Less than
3. Equal to
4. Not related to

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347. The chemical potential of a component (μi) of a phase is the amount by which its capacity for doing all work, barring work of expansion is increased per unit amount of substance added for an infinitesimal addition at constant temperature and pressure. It is given by

1. (∂E/∂n_i)_{S, v, nj}
2. (∂G/∂n_i)_{T, P, nj} = (∂A/∂n_i) T, v, nj
3. (∂H/∂n_i)_{S, P, nj}
4. All (A), (B) and (C)

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348. The chemical potential of any constituent of an ideal solution depends on the _________ of the solution.

1. Temperature
2. Pressure
3. Composition
4. All (A), (B) and (C)

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349. The co-efficient of performance (COP) of a refrigerating system, which is its index of performance, is defined as the ratio of useful refrigeration to the net work. The units of _________ and COP are the same.

1. Kinematic viscosity
2. Work
3. Temperature
4. None of these

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350. The compressibility factor for an ideal gas is 1. Its value for any other real gas is

1. 1
2. < 1
3. > 1
4. Either (B) or (C), depends on the nature of the gas

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