Analytical ChemistryHard
Question
Which of the following statement(s) is /are false ?
Options
A.Fe3+ gives red precipitate with dimethyl glyoxime in alkaline solution.
B.Cu2+ ion with potassium iodide solution gives a dirty brownish white precipitate which turns white on adding hypo solution.
C.A filter paper soaked in mercurous nitrate turns black in contact with ammonia gas.
D.Ag2O does not dissolve in nitric acid and ammonia solution.
Solution
(A) Fe2+ responds to this test but not Fe3+; Fe(II) gives soluble red iron(II) dimethylglyoxime in alkaline solution.
(D) Ag2O ↓ + 4NH3 + H2O → 2[Ag(NH3)2]+ + 2OH-
Ag2O ↓ + 2H+ → 2Ag+ + H2O
(B) and (C) are correct statements.
(D) Ag2O ↓ + 4NH3 + H2O → 2[Ag(NH3)2]+ + 2OH-
Ag2O ↓ + 2H+ → 2Ag+ + H2O
(B) and (C) are correct statements.
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