Which of the following substances is most likely to be a gas at room temperature and atmospheric pressure?

Question

Quizplus · Accepted Answer

Argon (Ar) is a noble gas and has a low boiling point (-185.8°C) and a low melting point (-189.3°C) which makes it exist as a gas at room temperature (around 25°C) and atmospheric pressure. The other choices (I₂, Pb, CCl₄, and C₈H₁₈) have higher boiling points and melting points and would exist as solids or liquids at room temperature and atmospheric pressure.

Which of the Following Substances Is Most Likely to Be