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   NiO + 6NH3.H2O = [Ni(NH3)6](OH)2 +  5H2O
    CdO + 4NH3.H2O = [Cd(NH3)4](OH)2 +  3H2O
    Cr2O3 + 12NH3.H2O = 2[Cr(NH3)6](OH)3+  9H2O
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