Question

Give tests for oxygen gas.

Answer 1

Oxygen gas tests include:

• It rekindles the flames of a glowing wooden splinter.
• It produces reddish-brown nitrogen dioxide fumes when mixed with colorless nitric oxide gas.
• $\underset{\mathrm{Nitric}\mathrm{Oxide}}{2\mathrm{NO}\left(\mathrm{g}\right)}+\underset{\mathrm{Oxygen}}{{\mathrm{O}}_2\left(\mathrm{g}\right)}\to \underset{\mathrm{Nitrogen}\mathrm{Dioxide}}{2{\mathrm{NO}}_2\left(\mathrm{g}\right)}$
• It turns brown when it dissolves in alkaline pyrogallol solution.