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When `KNO_(2)` and `CH_(2)COOH` is added as `CoCl_(2)` solution, yellow ppt of `K_(4)[Cu(NO_(2))_(6)]` is formed.

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When `KNO_(2)` and `CH_(2)COOH` is added as `CoCl_(2)` solution, yellow ppt of `K_(4)[Cu(NO_(2))_(6)]` is formed.
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Yellow ppt of `K_(3)[Co^(III)(NO_(2))_(6)]` and not of `K_(4)[Co(NO_(2))_(6)]` are obtained
`Co^(2+)+ 7NO_(2)^(Theta) + 2H^(oplus) + 3K^(oplus) rarr K_(3)[Co(No_(2))_(6)] darr + NO uarr + H_(2)O`
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