1.

Which one among the following pairs of ions cannot be separated by H_2 S in dilute hydrochloric acid?

Answer»

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

Solution :Both `Bi^(3+)` and `Sn^(4+)` are PRECIPITATED as SULPHIDE in the PRESENCE of dil. HCl


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