Question

Name four gaseous substances, which are pure.

Answer 1

Pure gas:

A pure gas can be composed of individual atoms (such as a noble gas like neon), elemental molecules (such as oxygen), or complex molecules (composed of a variety of atoms) (e.g. carbon dioxide). A gas mixture, like air, has a number of pure gases.

Example - Hydrogen $\left({\mathrm{H}}_2\right)$, Oxygen $\left({\mathrm{O}}_2\right)$, Carbon dioxide $\left({\mathrm{CO}}_2\right)$ Methane$\left({\mathrm{CH}}_4\right)$, and Water vapour.