General Knowledge - General Science - Discussion

We do not use hydrogen because hydrogen is very inflammable gas and it caches fire immediately when is in the contact with a little spark.

We do not use oxygen gas because this gas is responsible for the combustion process and it helps the fire to burn more.so,we can't use oxygen gas.

Now carbon dioxide gas is not used in bulbs because carbon dioxide gas is not helpful for combustion of fire.

Now nitrogen gas is used in bulbs because when we see in periodic table nitrogen gas is on 7th no. so, it's atomic no. is seven. if we write the electronic configuration of nitrogen we see that his outer orbital is half filled and it,s more stable than other gases that are given in the options. this nitrogen gas molecules glow and emit radiations when current passes through it.

Yeah. Actually, argon gas is used in electric bulbs because it is an inert gas. A lot of heat is produced in the bulb. If any another gas is filled, gas inside the bulb react with water molecules in the air and will form compounds which can lead to an explosion. It can also cause in the short life period of bulbs. To avoid that situation inert gases like He, Ne, Ar are commonly used in bulbs. In olden times to avoid reaction evacuated bulbs were used. But after experiments, it was proven that inert gases filled bulbs have more longevity than that of evacuated bulbs.

Nitrogen gas is less reactive than other given gases. Generally we use Argon & krypton is because they are inert gases. These are noble gases. Which doesn't react easily.

These gases are filled in bulb because filament present in bulb is Tungsten. These gases increase life of Tungsten filament. Tungsten has melting point above 3000 degree C.

Hence it is use in electric bulb. Nitrogen is 78% abundant on earth. So it is used in electric bulb.

Nitrogen.

- It prevents the entry of oxygen so that the filament doesn't oxidize too quickly and become unfunctional. Many people have the wrong idea about the Electric bulbs that there is no vacuum in the electric bulb.
- Actually, argon gas or argon gas mixed with a little nitrogen is filled in the bulb under some pressure.

At the same time, the pressure of Argon gas would almost prevent 'evaporation' of the filament. Modern bulbs are usually filled with a mixture of argon and nitrogen.

More rarely, some bulbs are filled with pure argon, krypton or xenon. The earliest bulbs weren't filled with any gas but had the vacuum inside.

Nitrogen is used in bulbs because out of given four options it have half filled valency which makes it more stable than other options given in question.

Nitrogen have valency 1S2 2S2 2P3.. that means p orbital is half filled which is more stable than H 1S1 and oxygen 1S2 2S2 2P4... and carbon 1S2 2S 2P2.

Incandescent light bulbs heat a tungsten filament to extremely high temperatures. At such temperatures ordinary air would rapidly oxidize the filament and the bulb would burn out in seconds. Instead the bulbs are filled with argon, which is inert and will not react with the tungsten under any conditions.

Tungsten is the element that is used to make bulb filaments. Best, because of its high melting point (almost 3700 K) and good resistance to electrical current.

Incandescent light bulbs are filled with an inert gas like nitrogen, argon, or krypton - So that the filament doesn't catch fire.

The bulb is filled with an inert gas such as argon (93%) and nitrogen (7%) to reduce evaporation of the filament and prevent its oxidation at a pressure of about 70 kPa (0.7 atm).

Early lamps, and some small modern lamps used only a vacuum to protect the filament from oxygen.

Hey guys, as per the options, Nitrogen is the answer here. But Argon is more suitable if it comes in options. The reason behind it is its more inert property than Nitrogen and this property can give longer life to the filament and in turn reduce the overall expense!:-).