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    The minimum depression in freezing point will occur in NaCl (opt1).

    But how can we know which will have maximum freezing point and as we know the original freezing point of each compound? Please explain.

  • @anag

    Depression of freezing point of a solvent is a colligative property of a solution i.e., it depends on the number of solute particles irrespective of their nature relative to the total number of particles present in the solution. Therefore, more the number of solute particles, more is the depression of freezing point of the solvent. Also ionic compounds when dissolved in water, dissociate into anions and cations, so the van't Hoff factor, i must also be taken into consideration. By this, increasing the effective particle concentration in comparison to the covalent compounds.

    I hope you understood the concept..

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