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  Inorganic Chemistry

MINIUM OR RED LEAD, PB3O4 :

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It is prepared by heating PbO in air to above 673 K .

                    673 K
6 PbO + O2 ———> 2P3O4.

It is a red crystalline solid insoluble in water.

It is a mixed oxide PbO2 + 2PbO and reacts with HNO3 to form Pb(NO3)2 and PbO2

2PbO.PbO2 + 4HNO3 ——> Pb(NO3)2 + 2H2O + PbO2

It is a strong oxidising agent. It liberates chlorine with conc. HCl and O2 with conc. H2SO4

Pb3O4 + 8 HCl ——> 3 PbCl2 + 4 H2O + Cl2

2Pb3O4 + 6H2SO4 ——> 6 PbSO4 + 6 H2O + O2

It is used as a protective paint in iron, steel and silver mirrors and in glass industry.

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