# Lead has been placed in the group I and II because

(a) It shows the valency of one and two
(b) It forms insoluble $PbCl_2$
(d) It is partially soluble in water

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.