Question

question 6
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which of these is more likely to be a gas at room temperature?
ca₃p₂
nacl
so₂
lio₂

Explanation:

Ionic compounds (like $\text{Ca}_3\text{P}_2$, $\text{NaCl}$, $\text{LiO}_2$) have strong ionic bonds, leading to high melting/boiling points, so they are solids at room temperature. $\text{SO}_2$ is a covalent molecular compound with weak intermolecular forces, which has a low boiling point ($-10^\circ\text{C}$), so it exists as a gas at room temperature.

Answer:

C. $\text{SO}_2$