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Sometimes yellow turbidity appears while passing $H_{2} S$ gas even in slightly acidic medium the absence of  group radicals. This is because :

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sulphur is present in the mixture as impurity.

Of the oxidation of $H_{2} S$ gas by some acid radicals

III group radicals are precipitated as hydroxides.

IV group radicals are precipitated as sulphides.

answer is C.

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Detailed Solution

$H_{2} S (g)$ is oxidized by some acid radicals, sometimes yellow turbidity appears even in the absence of the IInd group of basic radicals. Hence, the correct option is C.

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