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(D) Phosphine reduces silver nitrate to metallic silver: $PH_3 + 6AgNO_3 + 3H_2O \rightarrow 6Ag + 6HNO_3 + H_3PO_3$. Organic tissues reduce silver ni

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(D) Phosphine reduces silver nitrate to metallic silver: $PH_3 + 6AgNO_3 + 3H_2O \rightarrow 6Ag + 6HNO_3 + H_3PO_3$. Organic tissues reduce silver nitrate to metallic silver. In most cases,finely divided silver is obtained,which appears as a black stain. Silver cyanide dissolves in potassium cyanide to form a complex,potassium dicyanoargentate$(I)$: $AgCN + KCN \rightarrow K[Ag(CN)_2]$.

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