1.

The ion that cannot be precipitate by both HCI and H_(2)S is

Answer»

`Pb^(2+)`
`Cu^(o+)`
`AG^(o+)`
`SN^(2+)`

Solution :`Cu^(o+)` disproportio nates in the aqueous solution to a very large extent
`2Cu^(o+) hArr Cu^(2+) +Cu`
`K = ([Cu^(2+)])/([Cu^(o+)]^(2)) = 1.6 xx 10^(6)`
THUS , the concentration of `Cu^(o+)` ion is verysmall , and HENCE it cannotbeprecipitate


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