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Question

At its melting point, ice is lighter than water because:

A
H2O molecules are more closely packed in the solid state.
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B
Ice crystals have a hollow hexagonal arrangement of H2O molecules.
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C
On melting of ice, the H2O molecules shrink in size.
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D
Ice forms mostly heavy water on melting
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Solution

The correct option is B Ice crystals have a hollow hexagonal arrangement of H2O molecules.
Ice crystals have a hollow hexagonal arrangement of H2O molecules.
In ice, the hydrogen-bonded molecules are farther apart than in the liquid state.
This arrangement traps more space - which is why ice is less dense than
water.

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