Which of the following reagent will give green ppt with Cu+2 solution?
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Copper(II) ions (Cu2+) form characteristic colored precipitates with different reagents. To identify which gives a green precipitate, we analyze each reaction:
With K3[Fe(CN)6] (potassium ferricyanide), a chocolate brown precipitate of Cu2[Fe(CN)6] forms.
With KI, a white precipitate of CuI forms, which quickly decomposes to brown Cu2I2 and iodine.
With KCN, a yellow precipitate of Cu(CN)2 forms, which is unstable.
With K4[Fe(CN)6] (potassium ferrocyanide), a reddish-brown precipitate of Cu2[Fe(CN)6] forms. None of these are green. The reagent for a green precipitate is actually sodium carbonate (Na2CO3), forming basic copper carbonate, CuCO3·Cu(OH)2. Therefore, none of the provided options are correct for a green ppt.
Final Answer: None of the above