1.

Sometimes yellow turbidity appears while passing H_2 S gas even in the absence of II group radicals. This is because

Answer»

Sulphur is present in the MIXTURE as impurity
IV group radicals are precipitated as sulphides
of the oxidation of `H_(2)S` gas by some acid RADICAL
III group radicals are precipitated as hydroxide.

Solution :`H_2 S + UNDERSET("redical")underset("oxidising")underset("From some")([O]) to underset("sulphur")underset("Colloidal")(Sdarr) _H_(2)O`


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