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MCQs

Total Questions : 2096 | Page 5 of 210 pages
Question 41. Degree of freedom of a system consisting of a gaseous mixture of H₂ and NH₃ will be
  1.    0
  2.    1
  3.    2
  4.    3
 Discuss Question
Answer: Option D. -> 3
Question 42. The expression for entropy change given by, ΔS = - nR ln (P₂/P₁), holds good for
  1.    Expansion of a real gas
  2.    Reversible isothermal volume change
  3.    Heating of an ideal gas
  4.    Cooling of a real gas
 Discuss Question
Answer: Option B. -> Reversible isothermal volume change
Question 43. A closed system is cooled reversibly from 100°C to 50°C. If no work is done on the system
  1.    Its internal energy (U) decreases and its entropy (S) increases
  2.    U and S both decreases
  3.    U decreases but S is constant
  4.    U is constant but S decreases
 Discuss Question
Answer: Option B. -> U and S both decreases
Question 44. For any system, what is the minimum number of degrees of freedom?
  1.    1
  2.    0
  3.    2
  4.    3
 Discuss Question
Answer: Option B. -> 0
Question 45. Which of the following is not a unit of the equilibrium constant Kp? (where, Δx = number of moles of products number of moles of reactants)
  1.    (atm)Δx, when Δx is negative
  2.    (atm)Δx, when Δx is positive
  3.    Dimensionless, when Δx = 0
  4.    (atm)Δx2, when Δx > 0
 Discuss Question
Answer: Option D. -> (atm)Δx2, when Δx > 0
Question 46. Equilibrium constant of a reaction varies with the
  1.    Initial concentration of the reactant
  2.    Pressure
  3.    Temperature
  4.    None of these
 Discuss Question
Answer: Option C. -> Temperature
Question 47. Which of the following will increase the volume of a real gas by four times ?
  1.    Doubling the absolute temperature as well as pressure of the gas
  2.    Reducing pressure to one fourth at constant temperature
  3.    Reducing temperature to one fourth at constant pressure
  4.    Reducing the temperature to half and doubling the pressure
 Discuss Question
Answer: Option B. -> Reducing pressure to one fourth at constant temperature
Question 48. The accentric factor of a materical, 'ω', is defined as ω = -log10(Prsat)Tr⁻¹ = 0.7, where, Prsat = reduced vapor pressure, Tr = reduced temperature. The value of accentric factor is always
  1.    > 2
  2.    < 1
  3.    > 1
  4.    < 3
 Discuss Question
Answer: Option B. -> < 1
Question 49. The number of degrees of freedom for a mixture of ice and water (liquid) are
  1.    2
  2.    3
  3.    1
  4.    0
 Discuss Question
Answer: Option C. -> 1
Question 50. A solute distributes itself between two non-miscible solvents in contact with each other in such a way that, at a constant temperature, the ratio of its concentrations in two layers is constant, irrespective of its total amount". This is
  1.    The distribution law
  2.    Followed from Margule's equation
  3.    A corollary of Henry's law
  4.    None of these
 Discuss Question
Answer: Option A. -> The distribution law

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