Question

Name the gas which burns with a pop sound. Give a reaction through which it can be produced.

Answer 1

Metal with acid reaction:

• During the acids with metals, it forms salt and hydrogen gas, for which the general reaction can be written as:

$\mathrm{Metal}+\mathrm{Acid}\to \mathrm{Salt}+\mathrm{Hydrogen}$

• It is known as a displacement reaction in which an element displaces another element in a compound i.e the hydrogen in acids is displaced by the metals to produce hydrogen gas.
• Impure Hydrogen gas which basically contains traces of oxygen, nitrogen, and water vapor burns with a pop sound as it is highly combustible nature of hydrogen.
• When, a spark is introduced to impure Hydrogen gas, a highly exothermic reaction occurs.
• Due to this a sudden temperature rise happens,and the gases expand on heating, which generally occurs very fast, in milliseconds.
• This sudden expansion of these hot gases, causes a compression on the surrounding gases, producing a sound wave, that we hear as a pop sound.
• Hence the chemical reaction of the production of hydrogen gas can be shown as :
  $\underset{\left(\mathrm{Zinc}\right)}{\mathrm{Zn}\left(\mathrm{s}\right)}+\underset{\left(\mathrm{Sulphuric}\mathrm{acid}\right)}{{\mathrm{H}}_2{\mathrm{SO}}_4\left(\mathrm{aq}\right)}\to {\mathrm{ZnSO}}_4\left(\mathrm{aq}\right)+\underset{\left(\mathrm{Hydrogen}\right)}{{\mathrm{H}}_2\left(\mathrm{g}\right)}\mathrm{energy}$

Hence, from the above explanation, we can conclude that the gas which burns with pop sound is Hydrogen gas.