1.

Which pair of ions cannot be seperated by H_(2)S in dil/HCl

Answer»

`Bi^(3+),SN^(4+)`
`Zn^(2+),Cu^(2+)`
`AL^(3+),Ni^(2+)`
`Ni^(2+),Cu^(2+)`

SOLUTION :Only `Ni^(2+)` give PPT in presence of `NH_(4)OH`, not in presence of HCL.


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