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MCQs

Total Questions : 2096 | Page 23 of 210 pages
Question 221. Pick out the correct statement.
  1.    A real gas on expansion in vacuum gets heated up
  2.    An ideal gas on expansion in vacuum gets cooled
  3.    An ideal gas on expansion in vacuum gets heated up
  4.    A real gas on expansion in vacuum cools down whereas ideal gas remains unaffected
 Discuss Question
Answer: Option D. -> A real gas on expansion in vacuum cools down whereas ideal gas remains unaffected
Question 222. An irreversible process
  1.    Is the analog of linear frictionless motion in machines
  2.    Is an idealised visualisation of behaviour of a system
  3.    Yields the maximum amount of work
  4.    Yields an amount of work less than that of a reversible process
 Discuss Question
Answer: Option D. -> Yields an amount of work less than that of a reversible process
Question 223. Solid and liquid phases of a substance are in equilibrium at the
  1.    Critical temperature
  2.    Melting point
  3.    Freezing point
  4.    Both B and C
 Discuss Question
Answer: Option D. -> Both B and C
Question 224. A gas has a volume of 27.3 c.c. at 0°C. Its volume at 10°C (if pressure remains unchanged) will be __________ c.c.
  1.    2.73
  2.    28.3
  3.    273
  4.    283
 Discuss Question
Answer: Option B. -> 28.3
Question 225. __________ explains the equilibrium constant for any chemical reaction.
  1.    Henry's law
  2.    Law of mass action
  3.    Hess's law
  4.    None of these
 Discuss Question
Answer: Option B. -> Law of mass action
Question 226. The root mean square speed of molecules of a gas is equal to (where, m = mass of the molecule K = Boltzman's constant, T = absolute temperature)
  1.    √(2KT/m)
  2.    √(3KT/m)
  3.    √(6KT/m)
  4.    3KT/m
 Discuss Question
Answer: Option B. -> √(3KT/m)
Question 227. The number of degrees of freedom for an azeotropic mixture in a two component vapour-liquid equilibria is/are
  1.    Zero
  2.    One
  3.    Two
  4.    Three
 Discuss Question
Answer: Option B. -> One
Question 228. Compressibility factor for almost all the gases are approximately same at the same
  1.    Pressure and temperature
  2.    Reduced pressure and reduced temperature
  3.    Critical pressure and critical temperature
  4.    None of these
 Discuss Question
Answer: Option B. -> Reduced pressure and reduced temperature
Question 229. At triple point (for one component system), vapour pressure of solid as compared to that of liquid will be
  1.    More
  2.    Less
  3.    Same
  4.    More or less ; depending on the system
 Discuss Question
Answer: Option C. -> Same
Question 230. __________ law of thermodynamics ascertains the direction of a particular spontaneous process.
  1.    Zeroth
  2.    First
  3.    Second
  4.    Third
 Discuss Question
Answer: Option C. -> Second

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