When HCl is added to metal ions, metal chlorides are produced. In this problem, it is asked whether the given ions precipitate or not when added to HCl. According to the rule, all chlorides except Ag+, Pb 2+, Hg2 2+ are soluble. Hence the ion that would precipitate is only lead (II) ion.
1- false
2- true
3- true
4- false
5- true
6- false
7- true
8- true
9- true
10- false
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The the last one, but isn't it c6h12o6?