1.

Potassium ferrocyanide is used for testing

Answer»

`Cu^(2+)` and `ZN^(2+)`
`Fe^(3+)` and `CA^(2+)`
`Ag^(+)` and `Zn^(2+)`
`Th^(4+)` and `Cu^(2+)`

Solution :(A)`Cu_(2)[Fe(CN)_(6)],K_(2)Zn_(3)[Fe(CN)_(6)]_(2)`, (B)`Fe_(4)[Fe(CN)_(6)]_(3),K_(2)Ca[Fe(CN)_(6)]`
(C )`Ag_(4)[Fe(CN)_(6)],K_(2)Zn_(3)[Fe(CN)_(6)]`, (D)`Th[Fe(CN)_(6)],Cu_(2)[Fe(CN)_(6)]`


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