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At its melting point, ice is lighter than water because

1. (a) H2O molecules are more closely packed in solid state
2. (b) Ice crystals have hollow hexagonal arrangement of H2O molecules
3. (c) On melting of ice the H2O molecule shrinks in size
4. (d) Ice forms mostly heavy water on first melting

Correct answer: (b) Ice crystals have hollow hexagonal arrangement of H2O molecules

Solution

Ice is lighter than water at its melting point because its molecules are arranged in a hollow hexagonal structure, which creates empty spaces and reduces density.

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