Sometimes yellow turbidity appears on passing | vedclass

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Question

(B) The correct answer is $B$. Sometimes,yellow turbidity is observed upon passing $H_2S$ gas even when second group radicals are absent. This occurs

Vedclass · Accepted Answer

The fourth group radicals are precipitated as sulphides

Vedclass · Answer

(B) The correct answer is $B$. Sometimes,yellow turbidity is observed upon passing $H_2S$ gas even when second group radicals are absent. This occurs because certain fourth group radicals (such as $Zn^{2+}$,$Mn^{2+}$,$Ni^{2+}$,$Co^{2+}$) may precipitate as sulphides if the concentration of $S^{2-}$ ions in the solution is sufficiently high,leading to the formation of a colloidal suspension or turbidity.

Sometimes yellow turbidity appears on passing $H_2S$ gas even in the absence of the second group radicals. This happens because

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