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MCQs

Total Questions : 1913 | Page 18 of 192 pages
Question 171. A vapor whose partial pressure is less than its equilibrium vapor pressure is called a __________ vapor.
  1.    Saturated
  2.    Supersaturated
  3.    Superheated
  4.    None of these
 Discuss Question
Answer: Option C. -> Superheated
Question 172. Pick out the wrong statement.
  1.    'Reduced temperature' of a substance is the ratio of its existing temperature to its critical temperature, both expressed on celsius scale
  2.    'Reduced pressure' is the ratio of the existing pressure of a substance to its critical pressure
  3.    'Reduced volume' is the ratio of the existing molal volume of a substance to its critical molal volume
  4.    None of these
 Discuss Question
Answer: Option A. -> 'Reduced temperature' of a substance is the ratio of its existing temperature to its critical temperature, both expressed on celsius scale
Question 173. One Newton is equal to __________ dynes.
  1.    10²
  2.    10³
  3.    10⁴
  4.    10⁵
 Discuss Question
Answer: Option D. -> 10⁵
Question 174. The vapor pressure of the solvent decreased by 10 mm Hg, when a non-volatile solute was added to the solvent. The mole fraction of the solute in the solution is 0.2. What should be the mole fraction of the solvent, if the decrease in vapor pressure of the solvent is required to be 20 mm Hg.?
  1.    0.2
  2.    0.1
  3.    0.4
  4.    0.6
 Discuss Question
Answer: Option D. -> 0.6
Question 175. The average value of heat of neutralisation of dilute solution of strong acids and strong bases is about __________ kcal/kg.mole of water formed.
  1.    6680
  2.    13360
  3.    2481
  4.    97302
 Discuss Question
Answer: Option B. -> 13360
Question 176. The heat change for the reaction, C(s) + 2S(s) → CS₂(l), is 104.2 kJ. It represents the heat of
  1.    Formation
  2.    Solution
  3.    Combustion
  4.    Fusion
 Discuss Question
Answer: Option A. -> Formation
Question 177. Which of the following is not used for computing latent heat of vaporisation?
  1.    Clausius-Clayperon equation
  2.    Reference substance plots based on Durhing & Othmer plots
  3.    Kistyakowasky's equation
  4.    Hess
 Discuss Question
Answer: Option D. -> Hess
Question 178. 2 litres of nitrogen at N.T.P. weighs __________ gms.
  1.    14
  2.    2.5
  3.    28
  4.    1.25
 Discuss Question
Answer: Option B. -> 2.5
Question 179. The equilibrium value of the mole fraction of the gas dissolved in a liquid is directly proportional to the partial pressure of that gas above the liquid surface. This statement pertaining to the solubility of gases in liquid is the __________ law.
  1.    Raoult's
  2.    Henry's
  3.    Amgat's
  4.    None of these
 Discuss Question
Answer: Option B. -> Henry's
Question 180. Kinetic theory of gases stipulates that, the
  1.    Energy is lost during molecular collisions
  2.    Molecules possess appreciable volume
  3.    Absolute temperature is a measure of the kinetic energy of molecules
  4.    None of these
 Discuss Question
Answer: Option C. -> Absolute temperature is a measure of the kinetic energy of molecules

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