1.

Sometimes yellow turbidity appears o passing H_(2)S gas even in the absence of the second group radicals. This happens because

Answer»

Sulphur is present in the MIXTURE as an impurity
The FOURTH group radicals are precipitated as SULPHIDES
The `H_(2)S` is oxidized by some acid radicals
The THIRD group radicals are precipitated

SOLUTION :This is due to the precipitation of fourth group radical as sulphides due to high concentration of `S^(2-)` in the solution as a result yellow turbidity is obtained.


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