1.

At its melting point ice is lighter than water becouse

Answer»

on melting of ICE the `H_(2)O`molecule shrink in size
ice crystals have hollow HEXAGONAL arrangement of `H_(2)O`molecules
`H_2O` molecules are more closely PACKED in SOLID state
ice forms mostly HEAVY water on first melting

Solution :Ice crystals have open cage like structures.


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