Question

How can we test hydrogen gas?

Answer 1

One of the test which is mainly used for hydrogen tests is the pop sound test.

Whenever a burning candle is brought near the source of hydrogen, The gas will burn with a pop sound.

The burning of hydrogen means hydrogen is coming in contact with oxygen and result in the formation of water and a high amount of energy.

The reaction is highly exothermic.

$$\begin{gathered} 2{\mathrm{H}}_2\left(\mathrm{g}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right)\to 2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right) \\ \mathrm{Hydrogen}\mathrm{Oxygen}\mathrm{Water} \end{gathered}$$

An exothermic reaction is a reaction in which a high amount of energy is released

The energy released in this reaction is in the form of heat.

Because of this heat gas expands quickly and breaks the sound barrier resulting in a pop sound.

Final answer: Hydrogen gas makes a pop sound upon burning.