Potassium ferrocyanide is used for testing :

Options

A. `Cu^(2+)` and `Zn^(2+)`
B. `Fe^(3+)` and `Ca^(2+)`
C. `Ag^(+)` and `Zn^(2+)`
D. `Th^(4+)` and `Cu^(2+)`

Answer

A, B, C, D

Explanation

`Th^(4+) +Fe(CN)_(6)^(4-)rarr underset(("White ppt"))(Th[Fe(CN)_(6)]darr)`