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Abnormal molecular masses



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Q1. 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%?

(a) 0.25
(b) 0.5
(c) 0.75
(d) 0.4

Q2. 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?

(a) 0.00005
(b) 1.005
(c) 1.0005
(d) 1.00005

Q3. Which of the following aqueous solutions should have the least boiling point?

(a) 1.0 M KOH
(b) 1.0 M (NH4)2SO4
(c) 1.0 M K2CO3
(d) 1.0 M K2SO4

Q4. What is the Van?t Hoff Factor for 1 mole of BaCl2, assuming 100% dissociation?

(a) 0.33
(b) 1
(c) 3
(d) 2

Q5. 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)

(a) 1.5
(b) 0.8
(c) 0.5
(d) 0.2

Q6. The Van?t Hoff Factor for a solution of glucose in water is equal to 1.

(a) True
(b) False
(c) Both acidolysis and aldehyde
(d) None of the mentioned

Q7. In which of the following solutions will the Van?t Hoff Factor for the solute be lesser than 1?

(a) Sodium chloride in water
(b) Benzoic acid in benzene
(c) Acetic acid in benzene
(d) Phenol in benzene

Q8. What is the value of the Van?t Hoff factor (i) for solutes that dissociate in water?

(a) > 1
(b) < 1
(c) = 0
(d) Not defined

Q9. Which of the following statements is correct?

(a) Solutes that dissociate in water have molar mass higher than the molar mass of the solute calculated theoretically
(b) Solutes that associate in water have molar mass higher than the molar mass of the solute calculated theoretically
(c) Solutes that dissociate in water experience a decrease in colligative properties
(d) Colligative properties are independent of the number of particles of the solute in the solution

Q10. . 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.

(a) True
(b) False
(c) Both acidolysis and aldehyde
(d) None of the mentioned


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907 views

2.5 L Of NaCl Solution Contain 5 Moles Of The Solute. What Is The Molarity ?

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2.5 L Of NaCl Solution Contain 5 Moles Of The Solute. What Is The Molarity ?

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786 views

The Statement "If 0.003 Moles Of A Gas Are Dissolved In 900 G Of Water Under A Pressure Of 1 Atmosphere, 0.006 Moles Will Be Dissolved Under A Pressure Of 2 Atmosphere", Illustrates

Modified 239 Year Ago

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239 Year Ago

The Statement "If 0.003 Moles Of A Gas Are Dissolved In 900 G Of Water Under A Pressure Of 1 Atmosphere, 0.006 Moles Will Be Dissolved Under A Pressure Of 2 Atmosphere", Illustrates

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0 Answer
774 views

If 1 M And 2.5 Litre NaOH Solution Is Mixed With Another 0.5 M And 3 Litre NaOH Solution, Then Molarity Of The Resultant Solution Will Be

Modified 239 Year Ago

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239 Year Ago

If 1 M And 2.5 Litre NaOH Solution Is Mixed With Another 0.5 M And 3 Litre NaOH Solution, Then Molarity Of The Resultant Solution Will Be

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675 views

The Solubility Of A Gas In Water Depends On

Modified 239 Year Ago

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239 Year Ago

The Solubility Of A Gas In Water Depends On

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0 Answer
596 views

When 7.1gm Na2SO4 (molecular Mass 142) Dissolved In 100ml H2O, The Molarity Of The Solution Is

Modified 239 Year Ago

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239 Year Ago

When 7.1gm Na2SO4 (molecular Mass 142) Dissolved In 100ml H2O, The Molarity Of The Solution Is

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0 Answer
573 views

Molarity Of A Given Orthophosphoric Acid Solution Is 3 M. Its Normality Is

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Molarity Of A Given Orthophosphoric Acid Solution Is 3 M. Its Normality Is

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