Question

Co2 is a gas write its two gaseous properties to justify it

Answer 1

Hmm I'm going to go with it's less dense that a solid or liquid i.e open a bottle of coke and the carbon dioxide bubbles float up and out of the bottle. If it was denser it would be a layer under the liquid

Or..
A gas has no definite shape or volume of its own. It acquires the shape of the container. Intermolecular attraction is the weakest in gases whereas intermolecular separation is the largest. Hence, molecules in a gas move very fast and the gas expands to fill all the space available.

Cooling changes it into liquid state.