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MCQs

Total Questions : 2096 | Page 205 of 210 pages
Question 2041. Gibbs free energy of mixing at constant pressure and temperature is always
  1.    + ve
  2.    ∞
  3.    - ve
 Discuss Question
Answer: Option C. -> - ve
Question 2042. Heating of water under atmospheric pressure is an __________ process.
  1.    Isothermal
  2.    Adiabatic
  3.    Isobaric
  4.    Isochoric
 Discuss Question
Answer: Option C. -> Isobaric
Question 2043. Partial molar free energy of an element A in solution is same as its
  1.    Chemical potential
  2.    Activity
  3.    Activity co-efficient
  4.    Fugacity
 Discuss Question
Answer: Option A. -> Chemical potential
Question 2044. Tea kept in a thermos flask is vigorously shaken. If the tea is considered as a system, then its temperature will
  1.    Remain unchanged
  2.    Decrease
  3.    First fall and then rise
  4.    Increase
 Discuss Question
Answer: Option D. -> Increase
Question 2045. A solid is transformed into vapour without going to the liquid phase at
  1.    Always
  2.    Below triple point
  3.    Triple point
  4.    Boiling point
 Discuss Question
Answer: Option C. -> Triple point
Question 2046. The number of degrees of freedom at the triple point of water is
  1.    2
  2.    1
  3.    Zero
  4.    3
 Discuss Question
Answer: Option C. -> Zero
Question 2047. Specific __________ does not change during phase change at constant temperature and pressure.
  1.    Entropy
  2.    Internal energy
  3.    Enthalpy
  4.    Gibbs energy
 Discuss Question
Answer: Option D. -> Gibbs energy
Question 2048. Which of the following is an extensive property of a system?
  1.    Molal heat capacity
  2.    Heat capacity
  3.    Concentration
  4.    Pressure
 Discuss Question
Answer: Option B. -> Heat capacity
Question 2049. Dryness fraction of wet steam is defined as the ratio of mass of vapour in the mixture to the mass of mixture __________ calorimeter is not used for measuring the dryness fraction of steam.
  1.    Bomb
  2.    Bucket
  3.    Throttling
  4.    Separating
 Discuss Question
Answer: Option A. -> Bomb
Question 2050. The expression for entropy change, ΔS = n Cp . ln (T₂/T₁), is valid for the __________ of a substance.
  1.    Heating
  2.    Both B and C
  3.    Simultaneous pressure & temperature change
  4.    Cooling
 Discuss Question
Answer: Option B. -> Both B and C

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