1.

Prussian blue is formed when

Answer»

Ferrous sulphate REACTS with `FeCl_(3) `
ferric sulphate reacts with `K_(4)[Fe(CN)_(6)]` 
 forrous ammonium sulphate reacts with `FeCl_(3)`
ammonium sulphate reacts with `FeCl_(3)`

ANSWER :B


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