Q.

The inert gas used as beacon light is -

A. Kr
B. Ar
C. He
D. Ne
Answer» D. Ne
Explanation: Neon is used in neon discharge lamps and advertising signs because the neon lights are visible from long distances. Since the light of neon signs has a better penetrating power through fog and mist, the neon signs are also used in beacon lights for the safety of air and sea navigation.
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