Which gas is most commonly used to fill incandescent electric light bulbs?

Correct answer: Hydrogen

Explanation: ✅ Correct Answer: C) Argon 📚 Explanation: Argon is a noble gas that is chemically inert, meaning it does not react with the hot tungsten filament inside the bulb. Filling the bulb with argon prevents the filament from oxidizing and significantly slows down the evaporation of tungsten. This helps in maintaining the structural integrity of the filament and extends the lifespan of the bulb.