Question

Respiration in living things and burning are the important uses of ---- gas?

Answer 1

Air is a mixture of gases with higher quantities of oxygen, nitrogen, and carbon dioxide, and much lower levels of argon, water vapour, and other gases. The clean gas is where all living things breathe and live. It has an amorphous form and volume. It is colourless and odourless. Because air is a substance, it has mass and weight. Atmospheric pressure is created by the weight of air.
Animals need to breathe the oxygen in the air to perform aerobic respiration. We breathe in oxygen, which reaches the lungs, where it is absorbed by blood capillaries and carbon dioxide is exhaled into the air. Photosynthesis in plants necessitates the presence of carbon dioxide.

Complete answer:
Respiration in living things and burning are the important uses of oxygen gas.
Importance of oxygen gas-
The presence of oxygen in the atmosphere is required for respiration. Human cells require a steady supply of oxygen to survive; else, they will perish within minutes.
Aerobic respiration, which allows for the extraction of energy from ingested nutrients, requires oxygen in cells.
Hydrocarbon compounds are split apart by heating, and oxygen is employed to break them. This is utilised to start the combustion process, which usually results in the release of water and carbon dioxide.

Note:
Oxygen belongs to the chalcogen group on the periodic table. It is a necessary component in the majority of combustion processes.
It's one of the most common elements on the planet's surface.
Physical properties of oxygen-
In its natural condition, the gas is colourless, odourless, and tasteless. Liquid oxygen has a small paramagnetic property. With the exception of helium, neon, krypton, and argon, it is reactive and produces oxides with all other elements. In water, it is somewhat soluble.
One of the most prevalent allotropes of oxygen is dioxygen.
Trioxygen is the most reactive allotrope of oxygen, causing lung tissue damage. A is the name given to this allotrope.