Answer:
1) Water's structure allows for the formation of multiple hydrogen bonds with other molecules, including itself.
2) -4.8 °C
3) Each solution has the same number of relative particles of solute per kilogram of solvent.
Explanation:
1) the hydrogen attached to oxygen (a highly electronegative oxygen atom) thus is able to form hydrogen bond with other highly electronegative elements F,O and N. Due to this water has high boiling point as compared to other hydrides mentioned.
2) the freezing point depression is related to molality as:
Depression in freezing point = Kf X molality
depression in freezing point = 1.86 X 2.6 = 4.836
So the freezing point of aqueous solution = -4.836 °C
3) The colligative property depends upon the number of non volatile solute particles and not on nature of molar mass.
Thus both solution exhibit same collgative properties as we have taken one mole of each.