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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 the `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)]. `
Q. `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

I, II, III

B

I, III

C

II, III

D

I only

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The correct Answer is:
A
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Iron (+II) is one of the most important oxidation states and salts are called ferrous salts. Most of the 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)] . Q. Anhydrous FeCl_(2) is made by :

Iron (+II) is one of the most important oxidation states and salts are called ferrous salts. Most of the 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)] . Q. 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_(3)^(-) and the conc. H_(2)SO_(4) is run down the side of the test tube. It the mixture gets hot or is shaken. (I) the brown colour disappear (II)NO is evolved (III) a yellow solution in Fe_(2)(SO_(4))_(3) is formed

O.N of Fe in K_(4)[Fe(CN)_(6)] is

Fe(CN)_(2)darr+KCN to K_(3)Fe(CN)_(6)

3KCN+Fe(CN)_(3)darr to K_(3)[Fe(CN)_(6)]

In K_(4)[Fe(CN)_(6)],Fe is in the form of

In the complex K_(2)Fe[Fe(CN)_(6)] :

K_(3)[Fe(CN)_(6)]+FeCl_(3) to Fe[Fe(CN)_(6)]darr

The complex K_(3)[Fe(CN)_(6)] furnishes

K_(4)[Fe(CN)_(6)]+2CuSO_(4)toCu_(2)[Fe(CN)_(6)]darr

VK JAISWAL ENGLISH-d-BLOCK ELEMENTS-Level 3
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