![]() Inference:Yellow precipitate is due to the formation of ammonium arseno molybdate. To a part of the solution in a test tube, add ammonium molybdate solution and heat - Yellow precipitateis formed. Inference: The chocolate brown precipitate is due to the formation of Cu 2. To one part of the blue solution in a test tube add few drops of acetic acid and potassium ferrocyanide solution - Chocolate brown precipitate is formed. Inference: Yellow precipitate is due to the formation of Lead iodide, PbI 2. To one part of the solution in a test tube add potassium iodide solution - Yellow precipitate is formed -The ppt dissolves in boiling water and on cooling recrystalises. Inference:The yellow residue of As 2S 3 is dissolved in Conc. HNO 3 into the yellow precipitate in a test tube –Precipitate dissolves. Inference:The blue coloured solution is due to the formation of 2 by the reaction between Cu(NO 3) 2 and NH 4OH.Īdd some Conc. To rest of the solution add NH 4OH in excess - Blue coloured solution (Cu 2+) Inference: On adding H 2SO 4, white precipitate of lead sulphate, PbSO 4 is formed.ĭissolve the precipitate in hot ammonium acetate solution and divide the solution into two parts: To one part of the above solution, add dil. Inference:Black precipitate dissolves in 50% HNO 3 either due to the formation of Pb(NO 3) 2 or due to the formation of Cu(NO 3) 2. Heat the black precipitate with minimum quantity (1-2 ml) of 50% HNO 3 in a tests tube - Precipitate dissolves.
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