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Short Answer Type

31. What is Van’t Hoff factor i of the compound AlCl₃?

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32. Define Van’t Hoff factor ‘i’?

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33. Define an ideal solution.

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34. Differentiate between molarity and Molality?

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35. What is the Van’t Hoff factor of a compound which undergoes tetramerisation in an organic solvent?

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36. State Raoult’s law for dilute solutions?

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37. Define Molality in terms of elevation in boiling point?

Answer:

For dilutesolutions the elevation of boiling point (ΔTb) is directly proportional to the molal concentration of the solute in a solution. Thus
ΔTb ∝ m
or ΔTb = K_bm
Here m (molality) is the number of moles of solute dissolved in 1 kg of solvent and the constant of proportionality, Kb is called Boiling Point
Elevation Constant or Molal Elevation Constant . The unit of Kb is K kg mol-1.

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