Analytical ChemistryHard
Question
Which of the following is/are correct for potassium ferrocyanide ?
Options
A.It gives a brown precipitate with Cu2+ ions.
B.It gives a white precipitate of mixed salt with Ca2+ ions.
C.It in excess gives a bluish white/white precipitate with Zn2+.
D.It develops a deep red colouration with Fe3+.
Solution
(A) Cu2+ + [Fe(CN)6]4- → Cu2[Fe(CN)6] ↓ (brown).
(B) Ca2+ + 2K+ + [Fe(CN)6]4- → 2K+ Ca2+[Fe(CN)6] ↓ (white).
(C) 3Zn2+ + 2K+ + 2[Fe(CN)6]4- → K2Zn3[Fe(CN)6]2 ↓ (white/bluish-white).
(D) Fe3+ + [Fe(CN)6]4- → Fe4[Fe(CN)6]3 (prussian blue).
(B) Ca2+ + 2K+ + [Fe(CN)6]4- → 2K+ Ca2+[Fe(CN)6] ↓ (white).
(C) 3Zn2+ + 2K+ + 2[Fe(CN)6]4- → K2Zn3[Fe(CN)6]2 ↓ (white/bluish-white).
(D) Fe3+ + [Fe(CN)6]4- → Fe4[Fe(CN)6]3 (prussian blue).
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