Why is lead(II) present in two groups of cation analysis? [closed]

Well, I found that lead cation $$\ce{Pb^2+}$$ is present in both group 1 and group 2 of cation analysis. But why?

closed as unclear what you're asking by Jon Custer, aventurin, Mithoron, Tyberius, airhuffJan 29 at 20:11

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