Chemical Engineering Thermodynamics

211. If an ideal solution is formed by mixing two pure liquids in any proportion, then the _________ of mixing is zero

1. Enthalpy
2. Volume
3. Both 'a' & 'b'
4. Neither 'a' nor 'b'

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212. If atmospheric temperature and dew point are nearly equal, then the relative humidity is

1. Zero
2. 50%
3. Almost 100%
4. unpredictable

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213. If different processes are used to bring about the same chemical reaction, the enthalpy change is same for all of them. This is _________ law.

1. Hess's
2. Kirchoff's
3. Lavoisier and Laplace
4. None of these

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214. If heat contents of CH4, C2H4 and C3H8 are -17.9, 12.5 and -24.8 kcal/mole respectively, than ΔH for the reaction CH4(g) + C2H4(g) ⇌ C3H8(g) will be _________ Kcal.

1. -19.4
2. -30.2
3. 55.2
4. -55.2

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215. If the heat of solution of an ideal gas in a liquid is negative, then its solubility at a given partial pressure varies with the temperature as

1. Solubility increases as temperature increases
2. Solubility increases as temperature decreases
3. Solubility is independent of temperature
4. Solubility increases or decreases with temperature depending on the Gibbs free energy change of solution

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216. If the internal energy of an ideal gas decreases by the same amount as the work done by the system, then the

1. Process must be isobaric
2. Temperature must decrease
3. Process must be adiabatic
4. Both (B) and (C)

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217. If the molar heat capacities (C_p or C_v) of the reactants and products of a chemical reaction are identical, then, with the increase in temperature, the heat of reaction will

1. Increase
2. Decrease
3. Remain unaltered
4. Increase or decrease; depends on the particular reaction

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218. If the pressure on 100 c.c. of air is halved, then its volume (at the same temperature) would be _________ c.c.

1. 100
2. 50
3. 205
4. 200

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219. If the vapour pressure at two temperatures of a solid phase in equilibrium with its liquid phase are known, then the latent heat of fusion can be calculated by the

1. Maxwell's equation
2. Clausius-Clapeyron Equation
3. Van Laar equation
4. Nernst Heat Theorem

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220. If two gases have same reduced temperature and reduced pressure, then they will have the same

1. Volume
2. Mass
3. Critical temperature
4. None of these

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