Solid form of carbon dioxide is also known as:

Dry ice

The correct answer is option 1. Dry ice.

Solid form of carbon dioxide is also known as Dry ice. Dry ice is the solid form of carbon dioxide \((CO_2)\) at temperatures below -78.5°C (-109.3°F). It is called "dry ice" because it sublimates directly from a solid to a gas without passing through the liquid phase, leaving behind no liquid residue. Dry ice is commonly used as a cooling agent in various applications such as food preservation, transportation of perishable goods, and special effects in entertainment.