Abnormal Molar Masses MCQ

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• Acetic acid associates as dimers in benzene. What is the Van’t Hoff factor (i) if the degree of association of acetic acid is 50%?
  ক

  0.25

  খ

  0.50

  গ

  0.75

  ঘ

  0.40
• The pH of a 2 M solution of a weak monobasic acid (HA) is 4. What is the value of the Van’t Hoff factor?
  ক

  0.00005

  খ

  1.005

  গ

  1.0005

  ঘ

  1.00005
• Which of the following aqueous solutions should have the least boiling point?
  ক

  1.0 M KOH

  খ

  1.0 M (NH4)2SO4

  গ

  1.0 M K2CO3

  ঘ

  1.0 M K2SO4
• What is the Van’t Hoff Factor for 1 mole of BaCl2, assuming 100% dissociation?
  ক

  0.33

  খ

  1

  গ

  3

  ঘ

  2
• The depression of freezing point of a solution of acetic acid in benzene is – 0.2°C. If the molality of acetic acid is 0.1 m, then find the ratio of the normal mass to the abnormal mass. (Assume Kf of acetic acid = 4.0°C m-1)
  ক

  1.5

  খ

  0.8

  গ

  0.5

  ঘ

  0.2
• The Van’t Hoff Factor for a solution of glucose in water is equal to 1.
  ক

  True

  খ

  False
• In which of the following solutions will the Van’t Hoff Factor for the solute be lesser than 1?
  ক

  Sodium chloride in water

  খ

  Benzoic acid in benzene

  গ

  Acetic acid in benzene

  ঘ

  Phenol in benzene
• What is the value of the Van’t Hoff factor (i) for solutes that dissociate in water?
  ক

  > 1

  খ

  < 1

  গ

  = 0

  ঘ

  Not defined
• Only if the calculated molar mass is higher than the actual molar mass of the solute, the calculated molar mass is considered to be abnormal molar mass.
  ক

  True

  খ

  False