Multiple choice

Helium is a/an

  1. inert gas

  2. tear gas

  3. laughing gas

  4. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Helium is classified as an inert gas (also known as a noble gas). Noble gases are characterized by having complete valence electron shells, making them extremely stable and unreactive under normal conditions. Tear gas is used for riot control, laughing gas is nitrous oxide (N2O), so these are incorrect.

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