JEE Advanced | 2013Analytical ChemistryMedium
Question
Upon treatment with ammonical H2S , the metal ion that precipitates as a sulfide is -
Options
A.Fe(III)
B.Al(III)
C.Mg(II)
D.Zn (II)
Solution
Only Zn2+ gives white ppt. of ZnS with ammonical H2S, while
2Fe3+ + S2- → 2Fe2+ + S↓
Fe2+ + S2- → FeS ↓
Here the sulphide of Fe3+ is not obtained
Al3+ + S2- + H2O → Al(OH)3↓ + SH-
white ppt.
Mg2+ + S2- → No reaction
2Fe3+ + S2- → 2Fe2+ + S↓
Fe2+ + S2- → FeS ↓
Here the sulphide of Fe3+ is not obtained
Al3+ + S2- + H2O → Al(OH)3↓ + SH-
white ppt.
Mg2+ + S2- → No reaction
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