1.

Which of the following statements(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 thiocyanate.

Solution :`Fe^(2+)` ions give blue ppt. with `K_(3) [Fe(CN)_(6)]` . The blue ppt. appears due to the FORMATION of Turnbull.s blue , `K Fe[Fe(CN)_(6)] . Fe^(2+) + K_(3) [ Fe(CN)_(6)] to underset("(Turnbull.s blue)") underset("ferricyanide") underset("Potassium FERRO-")(K Fe[Fe(CN)_(6)] + 2K^(+)`
The red colouration that appears in case of `Fe^(3+)` ions on REACTION with potassium thiocyanate (KCNS) is due to formation of `[Fe(CNS)_(3)]`
`Fe^(3+) + 3 KCNS to underset("Ferric thiocyanate (red)") ([Fe(CNS)_(3)]) + 3K^(+)`


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