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MCQs

Total Questions : 1913 | Page 15 of 192 pages
Question 141. The molecules of a liquid which is in equilibrium with its vapor at its boiling point on an average have equal __________ in the two phases.
  1.    Potential energy
  2.    Intermolecular forces
  3.    Kinetic energy
  4.    Total energy
 Discuss Question
Answer: Option C. -> Kinetic energy
Question 142. The total number of atoms in 8.5 gm of NH₃ is __________ x 1023.
  1.    9.03
  2.    3.01
  3.    1.204
  4.    6.02
 Discuss Question
Answer: Option A. -> 9.03
Question 143. Which of the following holds good for a solution obeying Raoult's law (i.e., an ideal solution) (where, ΔH = heat of mixing, and ΔV = volume change on mixing ) ?
  1.    ΔH = 1 (+ ve)and Δ V = -ve
  2.    ΔH = 0
  3.    ΔV = 0
  4.    Both B and C
 Discuss Question
Answer: Option D. -> Both B and C
Question 144. Number of gm moles of solute dissolved in 1 kg of solvent is called its
  1.    Normality
  2.    Molarity
  3.    Molality
  4.    Formality
 Discuss Question
Answer: Option C. -> Molality
Question 145. If pH value of a solution is 8, then its pOH value will be
  1.    6
  2.    1
  3.    7
  4.    10
 Discuss Question
Answer: Option A. -> 6
Question 146. Solution made by dissolving equimolar amounts of different solutes in the same amount of a given solvent will have the
  1.    Same elevation in boiling point
  2.    Different elevation in boiling point
  3.    Elevation in boiling point in the ratio of their molecular weights
  4.    None of these
 Discuss Question
Answer: Option A. -> Same elevation in boiling point
Question 147. Dissolving a solute in a solvent does not change its
  1.    Specific heat
  2.    Vapour pressure
  3.    Viscosity
  4.    None of these
 Discuss Question
Answer: Option D. -> None of these
Question 148. For estimation of heat capacity of a solid compound, one can use
  1.    Clayperon's equation
  2.    Gibb's equation
  3.    Kopp's rule
  4.    Trouton's rule
 Discuss Question
Answer: Option C. -> Kopp's rule
Question 149. Pick out the wrong statement.
  1.    The effect of pressure on heat capacity of gases at pressure above one atmosphere and above the critical temperature is negligible
  2.    The value of Cp of gases increases with increase in pressure, above atmospheric pressure
  3.    The value of Cp at critical temperature and pressure reaches infinity
  4.    All of the above
 Discuss Question
Answer: Option A. -> The effect of pressure on heat capacity of gases at pressure above one atmosphere and above the critical temperature is negligible
Question 150. Heat of transition is the heat evolved or absorbed, when a substance is converted from
  1.    Vapor to liquid
  2.    Vapor to solid
  3.    Solid to liquid
  4.    One allotropic form to another allotropic form
 Discuss Question
Answer: Option D. -> One allotropic form to another allotropic form

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