Pb(NO3)2 + MnO2 + 6KOH K2PbO2 + K2MnO4 + 2KNO2 + 4H2O
Lead(II) nitrate react with manganese(IV) oxide and potassium hydroxide to produce lead(II)-potassium oxide, potassium manganate, potassium nitrite and water. This reaction takes place at a temperature of 400-450°C.