1.

Lead has been placed in the group I and II because

Answer»

it shows the valency of one and two
it forms INSOLUBLE `PbCl_(2)`
it forms lead sulphide
it is partially soluble in water

Solution :`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.


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