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Iron (+II) is one of the most important ...

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)`

Text Solution

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The correct Answer is:
D
Conceptual
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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)] Anhydrous FeCl_(2) is made by

K_(4)[Fe(CN)_(6)] is used to detect

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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)] FeSO_(4) is used in brown ring test for nitrates and nitrites. In this test , a freshly prepared FeSO_(4) solution is mixed with solution containing NO_(2)^(-) or NO_(2)^(-) and the conc. H_(2)SO_(4) is run down the side of the test tube. If the mixture gets hot or is shaken. I) the brown colour disappear II) No is evolved III) a yellow solution of Fe_(2)(SO_(4))_(3) is formed