Chemical Engineering Thermodynamics

241. In case of the decomposition of hydroiodic acid (2HI ⇌ H₂ + I2), addition of H₂ (at equilibrium condition) will

1. Increase the partial pressure of I₂
2. Decrease the partial pressure of HI
3. Diminish the degree of dissociation of HI
4. None of these

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242. In case of vapour compression refrigeration system, elevating the evaporator temperature (keeping the condenser temperature constant) results in

1. Enhanced COP
2. Decreased COP
3. No change in the value of COP
4. Increased or decreased COP; depending upon the type of refrigerant

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243. In jet refrigerators, the refrigerating fluid is practically always

1. Water
2. Ammonia
3. Freon
4. Brine

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244. In Joule-Thomson porous plug experiment, the

1. Enthalpy does not remain constant
2. Entire apparatus is exposed to surroundings
3. Temperature remains constant
4. None of these

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245. In polytropic process (PVⁿ = constant), if n = 1; it means a/an _________ process.

1. Adiabatic
2. Reversible
3. Isothermal
4. None of these

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246. In reactions involving solids and liquids (where change in volume is negligible), the heat of reaction at constant pressure as compared to that at constant volume is

1. More
2. Less
3. Same
4. Unpredictable; depends on the particular reaction

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247. In the ammonia synthesis reaction, N₂ + 3H₂ ⇌ 2NH₃ + 22.4 kcal, the formation of NH₃ will be favoured by

1. High temperature
2. Low pressure
3. Low temperature only
4. Both low temperature and high pressure

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248. In the decomposition of PCl5 represented by, PCl₅ ⇌ PCl₃ + Cl₂, decrease in the pressure of the system will _________ the degree of dissociation of PCl₅.

1. Increase
2. Decrease
3. Not alter
4. None of these

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249. In the equation PVⁿ = constant, if the value of n = y = C_p/C_v, then it represents a reversible _________ process.

1. Isothermal
2. Adiabatic
3. Isentropic
4. Polytropic

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250. In the equation, PVⁿ = constant, if the value of n = ± ∞, then it represents a reversible _________ process.

1. Adiabatic
2. Isometric
3. Isentropic
4. Isothermal

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