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For analytical determination of the Fe2+ ions red prussiate of potash salt is used. Its formula:

А.   K4[Fe(CN)6]

B.   K4[Fe(OH)6]

C.   KFe[Fe(CN)6]

D.   K3[Fe(CN)6]

E.  K4[Fe(CNS)6

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D.  K3[Fe(CN)6

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