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MCQs

Total Questions : 1913 | Page 12 of 192 pages
Question 111. Hess's law of constant heat summation is based on conservation of mass. It deals with
  1.    Equilibrium constant
  2.    Reaction rate
  3.    Changes in heat of reaction
  4.    None of these
 Discuss Question
Answer: Option C. -> Changes in heat of reaction
Question 112. Except for monoatomic gases, the molal heat capacity at constant volume for all gases is __________ Kcal/Kg mole.° K.
  1.    3
  2.    > 3
  3.    < 3
  4.    < 1
 Discuss Question
Answer: Option B. -> > 3
Question 113. Addition of a non-volatile solute to a solvent produces a __________ in its solvent.
  1.    Freezing point elevation
  2.    Boiling point depression
  3.    Vapor pressure lowering
  4.    All of the above
 Discuss Question
Answer: Option C. -> Vapor pressure lowering
Question 114. The temperature at which a real gas obeys Boyle's law is termed as the
  1.    Triple point
  2.    Boyle's temperature
  3.    Eutectic point
  4.    Inversion temperature
 Discuss Question
Answer: Option B. -> Boyle's temperature
Question 115. A vapor whose partial pressure is less than its equilibrium vapor pressure is called the __________ vapor.
  1.    Saturated
  2.    Superheated
  3.    Unsaturated
  4.    Dry gaseous
 Discuss Question
Answer: Option B. -> Superheated
Question 116. The osmotic pressure of a solution is directly proportional to the
  1.    Lowering of vapor pressure
  2.    Molecular concentration of the solute
  3.    Absolute temperature of a given concentration
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 117. At a temperature of 0°K, the molecules of a gas have only __________ energy.
  1.    Rotational
  2.    Vibrational
  3.    Translational
  4.    None of these
 Discuss Question
Answer: Option C. -> Translational
Question 118. Raoult's law is not applicable to the
  1.    Solutes which dissociate or associate in the particular solution
  2.    Concentrated solutions
  3.    Both B & C
  4.    Solutions containing non-volatile solute
 Discuss Question
Answer: Option C. -> Both B & C
Question 119. Which of the following is not a colligative property?
  1.    Osmotic pressure
  2.    Depression of freezing point
  3.    Lowering of vapor pressure
  4.    None of these
 Discuss Question
Answer: Option D. -> None of these
Question 120. The value of Trouton's ratio (λb/Tb) for a number of substances is 21 (where, λb = molal that of vaporisation of a substance at its normal boiling point, KCal/kg. mole and Tb = normal boiling point, °K). The Kis-tyakowsky equation is used for calculation of Trouton's ratio of __________ liquids.
  1.    Polar
  2.    Non-polar
  3.    Both A & B
  4.    Neither A nor B
 Discuss Question
Answer: Option C. -> Both A & B

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