1.

The ion that cannot be precipitated by both HCl and H_(2)S is

Answer»

`PB^(2+)`
`CU^(+)`
`Ag^(+)`
`Sn^(2+)`

Solution :`Cu^(+)` DISPROPORTIONATES in the aqueous solution to a very large EXTENT.
`2Cu^(+)hArrCu^(2+)+Cu`
`K=([Cu^(2+)])/([Cu^(+)]^(2))=1.6xx10^(6)`
THUS, the concentration of `Cu^(+)` ion is very small and hence it cannot be precipitated.


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