A noble gas used in advertising sign boards is

helium

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neon

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argon

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krypton

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Solution

The correct option is B
neon

Explanation of correct option:
Nobel gas
They are also called inert gas.
They do not react with other elements.
They are stable.
Example- helium, neon, argon, etc.
(B) Neon:
It is used in advertising sign lamps as it emits a reddish-orange glow when an electric current flows through it.
Explanation of incorrect option:
(A) Helium- It is the second lightest element and is used in welding and for asthma patients.
(C) Argon- It is used to fill in electric bulbs.
(D) Krypton- It is used in photography.
Hence, option (B) i.e. neon is correct.

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