Multiple choice general knowledge

Which of the following is not a gas?

  1. Nitrogen

  2. Oxygen

  3. Helium

  4. Mercury
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Nitrogen, oxygen, and helium are all gases at standard temperature and pressure. Mercury, however, is a metal that exists in liquid form at room temperature with a high surface tension. It is the only metal that is liquid under ordinary conditions, making it the correct answer as 'not a gas'.

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