Which of the following noble gas is used in light bulbs?

Helium

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Neon

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Krypton

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Argon

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Solution

The correct option is D Argon
Argon is used in light bulbs. The very thin metal filament inside the bulb would react with oxygen and burn away if the bulb were filled with air instead of argon. Argon stops the filament burning away because it is unreactive.

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