Question

$F{e}^{3+}$ ions in an aq. solution gives deep red colouration with both sodium acetate (in excess) and ammonium thiocyanate (slightly acidic). The deep red colouration obtained with ammonium thiocyanate gets decolourised on addition of solution containing $F^{-}$ ions. Which one of the following statement is false with respect to deep red colouration produced with $N{H}_{4}SCN$?

• A. The deep Red colour is bleached by Hg(II) ion.
• B. The deep Red colouration is due to the formation of a non-dissociated iron(III) thiocyanate complex.
• C. The deep Red coloured compound can be extracted by ether or amyl alcohol.
• D. None

Answer 1

The correct option is D None

Red colour produced with $N{H}_{4}SCN$ is $FeSC{N}^{2+}$.
The deep Red colour is bleached by Hg(II) ion because of the formation of $HgSC{N}^{2+}$.
The deep Red coloured compound can be extracted by ether or amyl alcohol.