Question

Ice is less dense then water. Give reason.

Answer 1

Intermolecular hydrogen bonding between the water molecules each water molecule is surrounded by the four other water molecules with their oxygen atom occupying the corner of the tetrahedon .Strong and stable hydrogen bonds forms a rigid hexagonal crystal lattice structure i.e. open cage structure between the water molecules with lots of interstitial vacant space, due to this the volume of ice is more than water and thus density is less than water.