Question

Density of water in the solid state is ______than the density of water in the liquid state.
A. higher
B. lower
C. same
D. none of these

Answer 1

Density of a substance is the ratio of the mass of the substance and the volume of it. It is expressed in units of $g/cc$ or $g/mL$.

Complete step by step answer:
The solid state of water is water is ice. An obvious observation is seen at home that ice floats on water. Why is it so because solids are heavier than liquids and it is supposed to dip inside water? Thus another factor is used to explain such a type of observation which is termed as density.
$Density = \dfrac{{mass}}{{volume}}$
Density is defined as the mass of the substance per unit volume.
The most perfect way to imagine how water can have diverse densities is imagined by the solidified shape of water. Ice really features an exceptionally distinctive structure than liquid water, in that the molecules align themselves in a customary grid instead of more arbitrarily as within the fluid frame.
The volume of solid is due to the way hydrogen bonds are oriented and decreases as it freezes. As a result the water molecules are pushed farther apart compared to liquid water. The density of ice is approximately $90$ percent that of water, but that can change since ice can contain air as well. Meaning that around $10$ percent of an ice (or ice sheet) will be over the water line.
So option B is the correct answer, i.e. the density of water in the solid state is lower than the density of water in the liquid state.

Note:
The density of water varies with temperature. Water’s lower density in its strong frame is due to the way hydrogen bonds are arranged when it solidifies.