Analytical ChemistryHard
Question
Sometimes yellow turbidity appears while passing H2S gas even in slightly acidic medium the absence of II group radicals. This is because :
Options
A.sulphur is present in the mixture as impurity.
B.IV group radicals are precipitated as sulphides.
C.of the oxidation of H2S gas by some acid radicals.
D.III group radicals are precipitated as hydroxides.
Solution
Oxidation by MnO4-, Cr2O72- or NO3- produces turbidity due to the formation of sulphur.
2MnO4- + 5H2S + 6H+ → 2Mn2+ + 5S↓ + 8H2O.
2MnO4- + 5H2S + 6H+ → 2Mn2+ + 5S↓ + 8H2O.
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