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Lead has been placed in the group I and II because

(a) It shows the valency of one and two
(b) It forms insoluble $PbCl_2$
(c) It forms lead sulphide
(d) It is partially soluble in water
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Answer: It is partially soluble in water
$PbCl_2$ is partially soluble in water and dissolves completely only in hot water. So part of it goes to group II, where it is precipitated as PbS.
answered Feb 1, 2014 by mosymeow_1
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