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Class 12 Chemistry Practice Test: Abnormal Molar Masses
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Class 12 Chemistry Practice Test: Abnormal Molar Masses
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10 Questions

1. Which of the following statements is correct?
2. The Van’t Hoff Factor for a solution of glucose in water is equal to 1.
3. Which of the following aqueous solutions should have the least boiling point?
4. 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.
5. 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?
6. In which of the following solutions will the Van’t Hoff Factor for the solute be lesser than 1?
7. 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%?
8. What is the value of the Van’t Hoff factor (i) for solutes that dissociate in water?
9. What is the Van’t Hoff Factor for 1 mole of BaCl2, assuming 100% dissociation?
10. 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)

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