(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

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The fourth group radicals are precipitated as sulphides

(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.

Class 12 Chemistry Principles Related to Practical Chemistry Wet Test for Basic Radical

Medium

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

AIIMS 1982 All AIIMS

A
Sulphur is present in the mixture as an impurity
B
The fourth group radicals are precipitated as sulphides
C
The $H_2S$ is oxidized by some acid radicals
D
The third group radicals are precipitated

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Wet Test for Basic Radical

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In the wet tests for identification of various cations by precipitation,which transition element cation does not belong to group $IV$ in qualitative inorganic analysis?

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$A$ solution containing a group $IV$ cation gives a precipitate on passing $H_2S$ gas. $A$ solution of this precipitate in dilute $HCl$ produces a white precipitate with $NaOH$ solution and a bluish-white precipitate with basic potassium ferrocyanide. The cation is:

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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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In the wet tests for identification of various cations by precipitation,which transition element cation does not belong to group $IV$ in qualitative inorganic analysis?

$A$ solution contains $Cl^{-}$,$I^{-}$,and $SO_{4}^{2-}$ ions. Which of the following ions is capable of precipitating all of the above when added to this solution?

Which ion$(s)$ precipitate when an oxalate solution is added to a mixture of $Ba^{2+}$,$Sr^{2+}$,and $Ca^{2+}$?

$A$ nitrate when mixed with common salt gives a white precipitate which is soluble in dilute $NH_4OH$. It is the nitrate of

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