Which one of the following gases produces a red light when electricity flows through it ?
Helium
Argon
Nitrogen
Neon
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This question was previously asked in
UPSC CAPF – 2020
When an electric current passes through a low-pressure gas in a tube, the gas atoms are excited and emit light as they return to their ground state. Different gases emit light of characteristic wavelengths (colors). Neon gas specifically emits a bright reddish-orange light when used in discharge tubes, famously known as “neon signs.”