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Question

Liquid water is denser than ice due to:

A
higher surface tension
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B
hydrogen bonding
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C
van der Waals forces
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D
covalent bonding
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Solution

The correct option is D hydrogen bonding
Due to inter-molecular hydrogen bonding, ice forms hexagonal three dimensional crystal lattice in which almost half the space is unoccupied. When ice melts, some of the hydrogen bonds are broken and some of the empty space is occupied by water molecules. Hence, liquid water is higher density than ice.

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