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In any ferric salt, on adding potassium ...

In any ferric salt, on adding potassium ferrocyanide, a prussian blue is obtained, which is

A

`K_3[Fe(CN)_6]`

B

`KFe[Fe(CN)_6]`

C

`FeSO_4. Fe(CN)_6`

D

`Fe_4[Fe(CN)_6)]_3`

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