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  1. The inert gas used as beacon light is

  2. A.

     Kr

    B.

     Ar

    C.

     He

    D.

     Ne

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    Answer : Option D

    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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