Question

Why are bulbs filled with inert gases such as Nitrogen or Argon?

• A. To prevent oxidation of Tungsten filament.
• B. To prevent dehydration of Tungsten filament.
• C. To prevent oxidation of Steel filament.
• D. None

Answer 1

The correct option is A

To prevent oxidation of Tungsten filament.

To prevent oxidation of Tungsten filament:

1. The filament of an electric bulb is made of tungsten, which burns quickly when exposed to oxygen in the air.
2. Electric bulbs are filled with non-reactive gases such as argon and nitrogen for this reason.
3. Bulbs are filled with chemically inactive Nitrogen or Argon gas to prevent oxidation of the tungsten filament used in the bulb.
4. The primary purpose of filling bulbs with inert gas is to prevent the filament from evaporating and oxidizing.
5. Argon is preferred due to its chemical inertness, low conductivity, and, most importantly, low cost.

Hence, the correct option is (A).