The evolution of oxygen gas can be tested by bringing a burning candle near it,if there is oxygen evolved in the chemical reaction, then flame of candle burn with higher intensity then general.

Introduction:
Oxygen gas (O2) is an essential component of the Earth's atmosphere and is necessary for the survival of most living organisms. It is involved in various chemical reactions and is commonly used in industries, medical applications, and everyday life. Understanding how to treat oxygen gas involves knowing its properties and handling it safely.

Properties of Oxygen Gas:
Oxygen gas is colorless, odorless, and tasteless. It is slightly soluble in water and is denser than air. Oxygen supports combustion, which means it can react with other substances and facilitate the burning process. However, it is not flammable itself.

Handling Oxygen Gas:
When handling oxygen gas, certain precautions need to be taken to ensure safety:

1. Storage: Oxygen gas should be stored in well-ventilated areas away from flammable materials, heat sources, and direct sunlight. It is typically stored in high-pressure cylinders or tanks designed for this purpose.

2. Handling: Oxygen cylinders should be handled with care to avoid dropping or damaging them. They should be kept upright to prevent leakage. Valves should be opened slowly and completely to avoid sudden release of high-pressure gas.

3. Fire Hazard: Oxygen supports combustion, so it should not be used near open flames or sparks. Smoking should be strictly prohibited in areas where oxygen is being used or stored.

Treating Oxygen Gas:
Treating oxygen gas involves utilizing its reactivity in various chemical reactions:

1. Combustion: Oxygen gas is involved in the process of combustion, which is the reaction between a fuel and oxygen to produce heat and light. For example, when a candle burns, it reacts with oxygen in the air to produce carbon dioxide, water vapor, and heat.

2. Oxidation: Oxygen gas is a powerful oxidizing agent, meaning it can accept electrons from other substances. This property is utilized in many chemical reactions, such as the rusting of iron, where iron reacts with oxygen to form iron oxide.

3. Respiration: Oxygen gas is essential for respiration in living organisms. During respiration, oxygen is used by cells to break down glucose and produce energy, releasing carbon dioxide as a byproduct.

Conclusion:
Treating oxygen gas involves understanding its properties, handling it safely, and utilizing its reactivity in various chemical reactions. Oxygen supports combustion, acts as an oxidizing agent, and is essential for respiration. By following proper safety protocols and utilizing oxygen gas in controlled environments, it can be effectively used in various applications.