Which of the following gases emits red light when electricity is passed through it?

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Accepted Answer

Step 1: Identify typical discharge colors

- Neon: When an electric discharge passes through neon gas it produces a bright red–orange glow; this is why neon signs appear red.
- Hydrogen: Hydrogen produces spectral lines (notably the H-alpha line) at $656\ 	ext{nm}$ which is red, but the glow is faint and not the characteristic bright red of neon discharge tubes.
- Argon: Argon discharge appears bluish-violet.
- Helium: Helium gives a pale yellow to peachy glow.

Step 2: Choose the best answer

Neon is the gas most commonly and characteristically known to emit bright red light under electric discharge. Therefore the correct choice is (1) Neon.

FINAL_ANSWER: a

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