Chemical Engineering Thermodynamics

171. Forward reaction will be favoured for the exothermic reaction, represented by CO + H2O ⇌ CO2 + H2, by

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

Correct answer: (A)
Low temperature and high pressure

172. Free energy

  1. Decreases in all spontaneous (or irreversible) processes
  2. Change during a spontaneous process has a negative value
  3. Remains unchanged in reversible processes carried at constant temperature and pressure
  4. All (A), (B) and (C)

Correct answer: (D)
All (A), (B) and (C)

173. Free energy change at equilibrium is

  1. Zero
  2. Positive
  3. Negative
  4. Indeterminate

Correct answer: (A)
Zero

174. Free energy change of mixing two liquid substances is a function of the

  1. Concentration of the constituents only
  2. Quantities of the constituents only
  3. Temperature only
  4. All (A), (B) and (C)

Correct answer: (D)
All (A), (B) and (C)

175. Free energy changes for two reaction mechanism 'X' and 'Y are respectively - 15 and - 5 units. It implies that „X’ is

  1. Slower than Y
  2. Faster than Y
  3. Three times slower than Y
  4. Three times faster than Y

Correct answer: (B)
Faster than Y

176. Free energy, fugacity and activity co-efficient are all affected by change in the temperature. The fugacity co-efficient of a gas at constant pressure _________ with the increase of reduced temperature.

  1. Decreases
  2. Increases
  3. Remains constant
  4. Decreases logarithmically

Correct answer: (B)
Increases

177. Fugacity and pressure are numerically equal, when the gas is

  1. In standard state
  2. At high pressure
  3. At low temperature
  4. In ideal state

Correct answer: (D)
In ideal state

178. Fugacity and pressure are numerically not equal for the gases

  1. At low temperature and high pressure
  2. At standard state
  3. Both (A) and (B)
  4. In ideal state

Correct answer: (C)
Both (A) and (B)

179. Fugacity co-efficient of a substance is the ratio of its fugacity to

  1. Mole fraction
  2. Activity
  3. Pressure
  4. Activity co-efficient

Correct answer: (C)
Pressure

180. Fugacity is a measure of the

  1. Escaping tendencies of the same substance in different phases of a system
  2. Relative volatility of a mixture of two miscible liquids
  3. Behaviour of ideal gases
  4. None of these

Correct answer: (A)
Escaping tendencies of the same substance in different phases of a system

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