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# Which one of the following $1.0 \times 10^{-3}$ molal aqueous solutions has the highest boiling point ?

$\begin {array} {1 1} (1)\;Aluminium\: (III) \: Chloride & \quad (2)\;Lead \: (II) \: Nitrate \\ (3)\;Sodium\: Chloride & \quad (4)\;Magnesium\: Nitrate \end {array}$