Question

The solid form of water is known as :
A . fog
B . dry ice
C . ice
D . snow

Answer 1

Hint : We know that water is tasteless, colourless and odourless substance .In nature it occurs in three states ;solid, gas and liquid. The solid form of water is known as ice. Liquid water is the most familiar form of water such as water lakes, rivers all are examples of liquid water. Gas is the water vapor.

Complete answer:
> Water molecules consist of two atoms of hydrogen and one atom of oxygen. Water can change its states from liquid to solid or gas and back to a liquid but its molecular structure remains constant. Water molecules move constantly as they have energy. In liquid state water molecules have more energy than solid states and in gas state molecules of water possess greater energy than liquid state. When the temperature of water reaches to ${0^0}C$ water molecules start freezing. When the water liquid cools down then the potential energy of molecules reduces and the movement of molecules becomes slow. Hence molecules stick together and form a solid.
> Dry ice is frozen carbon dioxide It is not water. It is used as a cooling agent for preservation of frozen food and used in mechanical cooling. Fog is an aerosol which consists of tiny water droplets or ice crystals suspended in the air. Now let's take a look at the last option that is snow. Snow is frozen atmospheric vapor which falls in winter on earth as light flakes. Snow is a crystal with air in it whereas ice is a frozen water without air interspersed.

Note : Now we know that the solid form of water is ice. The rest of the options are related to water but not its solid form. Hence option C is correct as it is a frozen form of water where water molecules are stacked together.