Preparing nitrogen (N2) in laboratory:
Heating a mixture of sodium nitrite and ammonium chloride gives ammonium nitrite (NH4NO2) which is highly unstable.
NaNO2 + NH4Cl → NH4NO2 + NaCl
Ammonium chlorate readily decomposes to give nitrogen gas.
NH4NO2→ N2 + 2H2O
Preparing hydrogen (H2) in the laboratory:
a) Zinc (Zn) when treated with sulphuric acid (H2SO4) liberates hydrogen gas.
Zn + H2SO4→ ZnSO4 + H2
b) Zinc when treated with hydrochloric acid (HCl) also liberates hydrogen gas.
Zn + 2HCl → ZnCl2 + H2
c) Water upon electrolysis gives hydrogen and oxygen. Electrolysis is the process of decomposition produced when an electric current is passed through a solution.
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