Analytical ChemistryMedium
Question
Which of the following statement (s) is (are) correct with reference to the ferrous and ferrici ions?
Options
A.Fe3+ gives brown colour with potassium ferricyanide
B.Fe2+ gives brown colour with potassium ferricyanide
C.Fe3+ gives red colour with potassium thiocyanate
D.Fe2+ gives brown colour with ammonium thiocyanate
Solution
Fe2+ gives blue colour with K3[Fe(CN)6] due to formation of Turnbull′s blue.
Fe2+ + K3[Fe(CN)6] → KFeII[FeIII(CN)6] + 2K+
Fe3+ gives red colour with KCNS due formation ferric thiocyante.
Fe3+ + 3KCNS → [Fe(CNS)3]3+ + 3K+
Red colour
Fe2+ + K3[Fe(CN)6] → KFeII[FeIII(CN)6] + 2K+
Fe3+ gives red colour with KCNS due formation ferric thiocyante.
Fe3+ + 3KCNS → [Fe(CNS)3]3+ + 3K+
Red colour
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