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MCQs

Total Questions : 2096 | Page 208 of 210 pages
Question 2071. For an ideal solution, the value of activity co-efficient is
  1.    1
  2.    > 1
  3.    < 1
 Discuss Question
Answer: Option A. -> 1
Question 2072. At 60° C, vapour pressure of methanol and water are 84.562 kPa and 19.953 kPa respectively. An aqueous solution of methanol at 60° C exerts a pressure of 39.223 kPa; the liquid phase and vapour phase mole fractions of methanol are 0.1686 and 0.5714 respectively. Activity co-efficient of methanol is
  1.    1.9398
  2.    4.238
  3.    1.572
  4.    3.389
 Discuss Question
Answer: Option C. -> 1.572
Question 2073. A/an __________ system is exemplified by a vessel containing a volatile liquid in contact with its vapor.
  1.    None of these
  2.    Isolated
  3.    Closed
  4.    Open
 Discuss Question
Answer: Option D. -> Open
Question 2074. The entropy change in a reversible isothermal process, when an ideal gas expands to four times its initial volume is
  1.    Cv loge 4
  2.    R log10 4
  3.    R loge 4
  4.    Cv log10 4
 Discuss Question
Answer: Option C. -> R loge 4
Question 2075. The theoretical minimum work required to separate one mole of a liquid mixture at 1 atm, containing 50 mole % each of n- heptane and n- octane into pure compounds each at 1 atm is
  1.    -RT ln 0.5
  2.    -2 RT ln 0.5
  3.    2 RT
  4.    0.5 RT
 Discuss Question
Answer: Option A. -> -RT ln 0.5
Question 2076. During Joule-Thomson expansion of gases
  1.    Enthalpy remains constant
  2.    Temperature remains constant
  3.    None of these
  4.    Entropy remains constant
 Discuss Question
Answer: Option A. -> Enthalpy remains constant
Question 2077. As pressure approaches zero, the ratio of fugacity to pressure (f/P) for a gas approaches
  1.    Unity
  2.    Infinity
  3.    Zero
  4.    An indeterminate value
 Discuss Question
Answer: Option A. -> Unity
Question 2078. When liquid and vapour phases of one component system are in equilibrium (at a given temperature and pressure), the molar free energy is
  1.    More in vapour phase
  2.    Same in both the phases
  3.    Replaced by chemical potential which is more in vapour phase
  4.    More in liquid phase
 Discuss Question
Answer: Option B. -> Same in both the phases
Question 2079. If the molar heat capacities (Cp or Cv) of the reactants and products of a chemical reaction are identical, then, with the increase in temperature, the heat of reaction will
  1.    Increase or decrease ; depends on the particular reaction
  2.    Decrease
  3.    Increase
  4.    Remain unaltered
 Discuss Question
Answer: Option D. -> Remain unaltered
Question 2080. For an irreversible process involving only pressure-volume work
  1.    (dF)T, p
  2.    (dA)T, v >0
  3.    (dF)T, p > 0
  4.    (dF)T, p = 0
 Discuss Question
Answer: Option A. -> (dF)T, p

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