Question

Statement-1 : Ice is less dense than liquid water.
Statement-2 : There are vacant spaces between hydrogen
bonded water molecules in ice.

Answer 1

Assertion (1) and assertion (2) both are true.

Explanation:

Statement 1 is true.

Ice is less dense than liquid water , because when molecules of water freeze more spaces are created between them due to their regular arrangement between hydrogen and oxygen atoms.

Statement 2 is also true.

There are vacant spaces between hydrogen  bonded water molecules in ice.

When temperature decreases, the molecules arrange themselves in a regular pattern due to which spaces are created among them.

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