1.

Which of the following statement(s) is (are) correct with reference to the ferrous and ferric ions ?

Answer»

`Fe^(3+)` gives BROWN colour with potassium ferricyanide.
`Fe^(2+)` gives blue precipitate with potassium ferricyanide.
`Fe^(3+)` gives red colour with potassium THIOCYANATE.
`Fe^(2+)` gives brown colour with ammonium thocyanate.

Solution :The blue precipitate of `Fe^(2+)` ions with potassium ferricyanide is due to formation of TURNBULL's blue `Kfe^(II)[Fe^(III)(CN)_(6)]`
`Fe^(3+)+K_(3)[Fe(CN)_(6)]to underset("Potassium ferro ferricyanide")(K.Fe^(II)[Fe^(III)(CN)_(6)]+2K^(+))`
the red colouration of `Fe^(3+)` ions with potassium thiocyanate is due to the formation of `[Fe(CNS)_(3)]`
`Fe^(3+)+3KCNSto underset("Ferric thiocyanate red colour")([Fe(CNS)_(3)])+3K^(+)`


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