Home Chemistry Enviromental Chemistry ( Not In Syllabus ) Practical Chemistry Sometimes yellow turbidity appears while pas…
Chemistry Enviromental Chemistry ( Not In Syllabus ) Practical Chemistry Single Correct MCQ
Published on: August 14, 2026

Sometimes yellow turbidity appears while passing H 2 S gas even in slightly acidic medium in the absence of ΙΙ group radicals. This is because :

A
sulphur is present in the mixture as impurity.
B
IV group radicals are precipitated as sulphides.
C
of the oxidation of H 2 S gas by some acid radicals.
D
ΙΙΙ group radicals are precipitated as hydroxides.

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The correct answer is:
C

Oxidation by MnO 4 – , Cr 2 O 7 2– or NO 3 – produces turbidity due to the formation of sulphur.

2MnO 4 – + 5H 2 S + 6H + 2Mn 2+ + 5S ↓ + 8H 2 O.

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