Which of the following is an inert gas most commonly found in light bulbs?
Argon
Correct Answer: Option 2 – Argon
Explanation:
In a traditional incandescent light bulb, a tungsten filament is heated by an electric current until it glows and produces light.
Argon is used inside the bulb because:
• It is a noble gas and is chemically inert.
• It does not react with the hot tungsten filament, even at very high temperatures.
• It reduces the evaporation of tungsten from the filament.
• It helps increase the life of the bulb and prevents the glass from blackening.
Argon is the most commonly used gas in incandescent bulbs and is sometimes mixed with nitrogen.
Why the other options are incorrect:
Option 1: Hydrogen
Hydrogen is highly flammable and can be dangerous inside a hot bulb.
Option 3: Oxygen
Oxygen would react with the hot tungsten filament and cause it to burn out quickly.
Option 4: Radon
Radon is a radioactive noble gas and is unsafe for use in light bulbs.
Therefore, argon is commonly used in electric bulbs because it is inert and protects the tungsten filament.
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