Q. 15.0( 2 Votes )

Some chemical sub

Answer :

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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