Question

Non-combustible gas among the following is
(A) Hydrogen
(B) Oxygen
(C) L.P.G
(D) natural gas.

Answer 1

Hint: In order to know which of the following gases are non-combustible, we must first know what is a combustible gas. A combustible gas is a gas which can catch fire/ burn in air. The gases that cannot catch fire immediately are known as the non-combustible gases.

Complete Solution :
Let us first understand about combustible gas. Any substance which can ignite/ catch fire is called a combustible substance. Combustible substance is slightly different from the flammable substances. Combustible substance requires some effort to catch fire while flammable substance will catch fire immediately. The degree of combustibility will depend on the volatility of the material. Some examples of the combustible substances are L.P.G, wood, CNG, charcoal, coal, diesel, petrol.
- While a non-combustible substance will not catch fire when exposed to air. Some examples are glass, sand, stone, etc. Oxygen is also a Non-combustible gas. It will only participate in combustion, because combustion is possible only in the presence of oxygen. The presence of oxygen when something is burning is very dangerous, because it can enhance or improve the process of burning.
So, the correct answer is “Option B”.

Note: Oxygen is not only helpful in the process of combustion; it has also got other uses such as
- We humans as well as animals will need oxygen for the respiration process.
- It will be used in the rockets and the missiles as an oxidizing agent. Oxygen will react with the liquid hydrogen to create some thrust which is important for the take off.
- Oxygen is used as a sterilizing agent and also in the purification of water.
- Oxygen plays an important role in the production of steel.