There are solubility rules and for soluble compounds some have exceptions next to them.
Such as Halides are soluble
Exception: Ag, Hg, Pb
What does it mean by exception?
For Halides would it be, that if the compound was AgCI it wouldn't be soluble?
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Right. AgCl, Hg2Cl2, and PbCl2 are not soluble. The other chlorides are. For whatever it's worth, PbCl2 is soluble in hot water but not cold water.
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