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After the precipitation of the Group I cations as chlorides by the reaction with HCl, nearly all of the precipitate dissolves in hot water. Which ion(s) are present? Which ion(s) are absent?

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Group I is Ag, Hg(+1), Pb.
PbCl2 is soluble in hot water. AgCl and Hg2Cl2 are not.
So ???? must be the ppt.

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