1)Abnormal boiling point:Due to its hydrogen bonding it requires more heat to break the internal bond. so, it has a high boiling point.
2)Density of ice is less than the density of water:
The number of hydrogen bonds is larger in ice than in water.As ice is a a solid , the molecules are rigidly held in space.Due to its cage like arrangement there is a vacant space.Hence ice has an expanded structure and density is less than of water..
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