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MCQs

Total Questions : 129 | Page 3 of 13 pages
Question 21. The vapor pressure of liquid benzene is given by ln p* = 15 – 1280/T, and that of vapor benzene is given by ln p* = 23 – 2560/T, what is the boiling point of benzene?
  1.    160 K
  2.    200 K
  3.    240 K
  4.    300 K
 Discuss Question
Answer: Option A. -> 160 K
Answer: (a).160 K
Question 22. The pressure of a compound at 200 K is 10 mm Hg and at 400 K it is 50 mm Hg, what is the pressure at T = 250 K?
  1.    18.1 mm Hg
  2.    24.2 mm Hg
  3.    36.3 mm Hg
  4.    48.4 mm Hg
 Discuss Question
Answer: Option A. -> 18.1 mm Hg
Answer: (a).18.1 mm Hg
Question 23. What is the vapor pressure of ammonia at 305 K, if it is given that the vapor pressure of ammonia at 315 K is 5 mm Hg and at 325 K it is 6 mm Hg?
  1.    1 mm Hg
  2.    2 mm Hg
  3.    3 mm Hg
  4.    4 mm Hg
 Discuss Question
Answer: Option D. -> 4 mm Hg
Answer: (d).4 mm Hg
Question 24. The vapor pressure of a compound in liquid phase is given by ln p* = 21 – 2800/T, and in solid phase it is given by ln p* = 28 – 3500/T, what is the sublimation temperature of the compound?
  1.    100 K
  2.    120 K
  3.    150 K
  4.    200 K
 Discuss Question
Answer: Option A. -> 100 K
Answer: (a).100 K
Question 25. For CaOCl₂ , the rate of evaporation is given by W = 325p^0.5M/T^1.5 g/liter, where T is in K, p in mm Hg, and M is molecular weight, if its pressure is given by ln p* = 25 – 2700/T, what is the evaporation rate at T = 150 K?
  1.    256 g/liter
  2.    499 g/liter
  3.    571 g/liter
  4.    744 g/liter
 Discuss Question
Answer: Option D. -> 744 g/liter
Answer: (d).744 g/liter
Question 26. Which of the following defines condensation?
  1.    Change of solid to vapor
  2.    Change of vapor to liquid
  3.    Change of liquid to vapor
  4.    Change of vapor to solid
 Discuss Question
Answer: Option B. -> Change of vapor to liquid
Answer: (b).Change of vapor to liquid
Question 27. Condensation starts at which point?
  1.    Dew point
  2.    Bubble point
  3.    Triple point
  4.    None of the mentioned
 Discuss Question
Answer: Option A. -> Dew point
Answer: (a).Dew point
Question 28. What is the fraction of water vapor at 27°C and 1 atm, if the fraction of water vapor at 127°C and 1 atm is 0.8?
  1.    0.2
  2.    0.4
  3.    0.6
  4.    0.8
 Discuss Question
Answer: Option C. -> 0.6
Answer: (c).0.6
Question 29. If the fraction of water vapor at 27°C and 5 atm is 0.5, then what is the fraction of water vapor at 27°C and 1 atm?
  1.    0.1
  2.    0.2
  3.    0.5
  4.    0.8
 Discuss Question
Answer: Option A. -> 0.1
Answer: (a).0.1
Question 30. Which of the following is not a way of condensation of vapor?
  1.    Cooling at constant volume
  2.    Cooling at constant pressure
  3.    Compress it isothermally
  4.    Compress it
 Discuss Question
Answer: Option D. -> Compress it
Answer: (d).Compress it

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