An ammoniacal metal salt solution gives a brilliant red precipitate on addition of dimethylglyoxime. The metal ion is :Cu2+Ni2+Fe2+Co2+

A metal salt solution does not give any precipitate even on excess addition of NH4OH but gives white precipitate on addition of NaOH. The metal salt and white precipitate respectively can bePb(NO3)2 and Pb(OH)2Ca(NO3)2 and Ca(OH)2ZnSO4 and Zn(OH)2MgCl2 and Mg(OH)2

If silver nitrate solution is added to a salt solution then a yellow precipitate is obtained, the salt may containBr–I–Cl–F–

A colorless aqueous solution contains nitrates of two metals, X and Y. When it was added to an aqueous solution of NaCl, a white precipitate was formed. This precipitate was found to be partly soluble in hot water to give a residue P and a solution Q. The residue P was soluble in aq. NH3 and also in excess sodium thiosulfate. The hot solution Q gave a yellow precipitate with KI. The metals X and Y, respectively, are4 pointsAg and PbAg and CdCd and PbCd and Zn

The ratio of the molar amounts of H2S needed to precipitate the metal ions form 20 ml each of 1 M Ca(NO3)2 and 0.5M CuSO4 is 1 : 1 2 : 1 1 : 2 indefinite

lead(II) nitrate solution + sodium chloride solution →       sodium ________ solution + lead(II) chloride precipitate