Sometimes yellow turbidity appears while passing \( \mathrm{H}_{2} ...

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Sometimes yellow turbidity appears while passing \( \mathrm{H}_{2} \mathrm{~S} \) gas even in slightly acidic medium in the absence of II group
\( \mathrm{P} \) radicals. This is because :

W
(a) sulphur is present in the mixture as impurity.
(b) IV group radicals are precipitated as sulphides.
(c) of the oxidation of \( \mathrm{H}_{2} \mathrm{~S} \) gas by some acid radicals.
(d) III group radicals are precipitated as hydroxides.
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