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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?

Answer:

Molarity: Molarity (M) is defined as number of moles of solute dissolved in one litre (or one cubic decimetre) of solution,

Molarity = \frac{Number of moles of solute}{Volume of solution in litres}

express unit in L^-1

Molality: Molality (m) is defined as the number of moles of the solute per kilogram (kg) of the solvent and is expressed as:

Molality = \frac{Number of moles of solute}{Mass of solvent in kilograms}

Express unit in Kg^-1

molality are independent of temperature, whereas molarity is a function of temperature. This is because volume depends on temperature and mass does not.

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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?

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38. What are azetropes? Give an example.

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39. What is the sum of the mole fraction of all the components in a three component system?

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40. What is meant by vapour pressure? What is effect of temperature on it?

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