Prussian blue is formed when :...

Prussian blue is formed when :

A

Ferrous sulphate reacts with `FeCl_3`

B

Fernc sulphate reacts with `K_4(Fe(CN)_6]`

C

Ferrous ammonium sulphate reacts with `FeCl_3`

D

Ammonium sulphate reacts with `FeCl_3`

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The correct Answer is:

B

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