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Cobalt Nitrate Test

Salts of zinc , tin, aluminum and magnesium which give white residue in the charcoal cavity test, on hating with cobalt nitrate form coloured double oxides as

2Co(NO3)2     →      2CoO + 4NO2 + O2
CoO + ZnO      →      CoO.ZnO

  CoO + ZnO    →     CoOZnO
                                    Dirty greem

CoO + AI2O3    →     CoOAI2O3

CoO + MgO      →      CoO. Mgo

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