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

Question

Which of the following statement(s) is (are) correct with reference to the ferrous and ferric ions ? (A) Fe3+ gives brown colour with potassium ferricyanide (B) Fe2+ gives blue precipitate with potassium ferricyanide (C) Fe3+ gives red colour with potassium thiocyanate (D) Fe2+ gives brown colour with ammonium thiocyanate

Tardigrade Admin · Accepted Answer

The blue precipitate of Fe2+ ion with potassium ferricyanide is due to formation of Turnbull- blue KFe[Fe(CN)6]. Fe2+ + K3 [Fe (CN)6] longrightarrow KFe [Fe(CN)6] + 2K+ The red colour of Fe3+ ion with potassium thiocyanate is due to formation of [Fe(SCN)3]. Fe3+ + 3KSCN longrightarrow underset textRed coloured[Fe (SCN)3] + 3K+

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

$F e^{3 +}$ gives brown colour with potassium ferricyanide

$F e^{2 +}$ gives blue precipitate with potassium ferricyanide

$F e^{3 +}$ gives red colour with potassium thiocyanate

$F e^{2 +}$ gives brown colour with ammonium thiocyanate

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

Fe3+ gives brown colour with potassium ferricyanide

Fe2+ gives blue precipitate with potassium ferricyanide

Fe3+ gives red colour with potassium thiocyanate

Fe2+ gives brown colour with ammonium thiocyanate

The blue precipitate of Fe2+ ion with potassium ferricyanide is due to formation of Turnbull- blue KFe[Fe(CN)6​]. Fe2++K3​[Fe(CN)6​]⟶KFe[Fe(CN)6​]+2K+ The red colour of Fe3+ ion with potassium thiocyanate is due to formation of [Fe(SCN)3​]. Fe3++3KSCN⟶Red coloured[Fe(SCN)3​]​+3K+

$F e^{3 +}$ gives brown colour with potassium ferricyanide

$F e^{2 +}$ gives blue precipitate with potassium ferricyanide

$F e^{3 +}$ gives red colour with potassium thiocyanate

$F e^{2 +}$ gives brown colour with ammonium thiocyanate