Analytical ChemistryHard
Question
Select the correct statement with respect to Fe3+ ions.
Options
A.Iron (III) ions react with H2S in acidic solution to give a black precipitate of Fe2S3.
B.Iron (III) ions react with ammonium sulphide to give the black precipitate of Fe2S3.
C.Iron (III) ions react with ammonium thiocyanate solution to produce deep red colouration.
D.All of these
Solution
(A) 2Fe3+ + H2S → 2Fe2+ + 2H+ + S↓ (white)
(B) 2Fe3+ + 3S2- → 2FeS↓ (black) + S↓
(C) Fe3+ + 3SCN- → Fe(SCN)3 deep red colouration
(B) 2Fe3+ + 3S2- → 2FeS↓ (black) + S↓
(C) Fe3+ + 3SCN- → Fe(SCN)3 deep red colouration
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