Question

Why ice have low intermolecular force..?

Answer 1

When water solidifies, hydrogen bonding between the molecules forces the molecules to line up in a way that creates empty space between the molecules, increasing the overall volume of the solid. This is why ice is less dense than liquid water.

Answer 2

ice has less intermolecular force as water has an unique feature that is, it expands when freezed. The particles are not close together so, the intermolecular force is less.