All substances have a liquid form, but may not be present in nature. Under extreme pressure and temperature circumstances, liquid oxygen can be created, in fact, it is used to fuel space rockets.
Liquid.
gas
A solid.
Air is a gas, made up of a mixture of different gases like nitrogen, oxygen, carbon dioxide, and others. While solids like dust particles and liquid water droplets can be found within the air, the air itself is considered a gas.
Oxygen can be liquid or a gas. It is just a different state of matter.
Liquid.
gas
a gas and a liquid cause it can be both
solid
solid.
Gas
solild
It is a rare solid.
soild
At STP it is a solid
Soild
solid