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MCQs

Total Questions : 2096 | Page 25 of 210 pages
Question 241. 1st law of thermodynamics is nothing but the law of conservation of
  1.    Momentum
  2.    Mass
  3.    Energy
  4.    None of these
 Discuss Question
Answer: Option C. -> Energy
Question 242. In a turbine, the fluid expands almost
  1.    Isothermally
  2.    Isobarically
  3.    Adiabatically
  4.    None of these
 Discuss Question
Answer: Option C. -> Adiabatically
Question 243. Specific/molar Gibbs free energy for a pure substance does not change during
  1.    Sublimation
  2.    Vaporisation
  3.    Melting
  4.    Either A, B or C
 Discuss Question
Answer: Option D. -> Either A, B or C
Question 244. A gas shows deviation from ideal behaviour at
  1.    Low pressure and high temperature
  2.    Low pressure and low temperature
  3.    Low temperature and high pressure
  4.    High temperature and high pressure
 Discuss Question
Answer: Option C. -> Low temperature and high pressure
Question 245. __________ equation predicts the activity co-efficient from experimental data.
  1.    Lewis-Randall
  2.    Margules
  3.    Van Laar
  4.    Both B & C
 Discuss Question
Answer: Option D. -> Both B & C
Question 246. Fugacity and pressure are numerically not equal for the gases
  1.    At low temperature and high pressure
  2.    At standard state
  3.    Both A and B
  4.    In ideal state
 Discuss Question
Answer: Option C. -> Both A and B
Question 247. Pick out the correct statement.
  1.    If an insoluble gas is passed through a volatile liquid placed in a perfectly insulated container, the temperature of the liquid will increase
  2.    A process is irreversible as long as Δ S for the system is greater than zero
  3.    The mechanical work done by a system is always equal to ∫P.dV
  4.    The heat of formation of a compound is defined as the heat of reaction leading to the formation of the compound from its reactants
 Discuss Question
Answer: Option D. -> The heat of formation of a compound is defined as the heat of reaction leading to the formation of the compound from its reactants
Question 248. Entropy change of mixing two liquid substances depends upon the
  1.    Molar concentration
  2.    Quantity (i.e. number of moles)
  3.    Both A and B
  4.    Neither A nor B
 Discuss Question
Answer: Option C. -> Both A and B
Question 249. Pick out the wrong statement.
  1.    Surface tension of a substance vanishes at critical point, as there is no distinction between liquid and vapour phases at its critical point
  2.    Entropy of a system decreases with the evolution of heat
  3.    Change of internal energy is negative for exothermic reactions
  4.    The accentric factor for all materials is always more than one
 Discuss Question
Answer: Option D. -> The accentric factor for all materials is always more than one
Question 250. Ideal gas law is applicable at
  1.    Low T, low P
  2.    High T, high P
  3.    Low T, high P
  4.    High T, low P
 Discuss Question
Answer: Option D. -> High T, low P

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