Iron `(+II)` is one of the most important oxidation states, and salts are called ferrous salts. Most of `Fe(+II)` salts are pale

Iron `(+II)` is one of the most important oxidation states, and salts are called ferrous salts. Most of `Fe(+II)` salts are pale green and contain `[Fe(H_(2)O)_(6)]^(2+)` ion. `Fe(+II)` compounds are easily oxidised by air and so are difficult to obtain pure `Fe^(2+)` form many complexes like `K_(4)[Fe(CN)_(6)]`
`K_(3)[Fe(CN)_(6)]` is used in the detection of `Fe^(2+)` ion with which it gives a deep blue colour. This colour is due to the formation of
A. `K_(2)Fe[Fe(CN)_(6)]`
B. `Fe_(4)[Fe(Cn)_(6)]_(3)`
C. `Fe[Fe(CN)_(6)]`
D. `Fe_(3)[Fe(CN)_(6)]_(2)`

Iron `(+II)` is one of the most important oxidation states, and salts are called ferrous salts. Most of `Fe(+II)` salts are pale green and contain `[F

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