The filament of an electric bulb is made of Tungsten. The bulbs are usually filled with which of the following chemically inactive gases to prolong the life of the filament?

Nitrogen and Argon

The correct answer is Option (2) → Nitrogen and Argon

Electric bulbs are filled with chemically inactive (inert) gases to prevent oxidation and reduce evaporation of the tungsten filament.

Among the given options:

• Nitrogen and Argon are commonly used inert gases in electric bulbs.
• Hydrogen is not inert and would react at high temperatures.
• Helium is inert but not commonly used alone or with hydrogen in bulbs.