Explain the method of preparation of hydrogen gas in laboratory with chemical equation and diagram?
In the laboratory, dihydrogen gas is prepared by taking zinc granules in a 500 ml flask.
To this, dilute HCl or dilute sulphuric acid is added through a thistle funnel.
Dihydrogen gas is released and the gas is collected by the downward displacement of water because it is a gas lighter than water
Reaction:
Zn(s)+2HCl(aq)→ZnCl2(aq)+H2(g)
Zn(s)+H2SO4(aq)→ZnSO4(aq)+H2(g).