In the analysis of Group-II basic radicals,H_ | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(C) The group-$II$ basic radicals are precipitated as their sulfides. $H_2S$ is a weak electrolyte and dissociates as: $H_2S \rightleftharpoons 2H^+ +

Vedclass · Accepted Answer

The dissociation of $H_2S$ decreases.

Vedclass · Answer

(C) The group-$II$ basic radicals are precipitated as their sulfides. $H_2S$ is a weak electrolyte and dissociates as: $H_2S \rightleftharpoons 2H^+ + S^{2-}$. In the presence of dilute $HCl$,the concentration of $H^+$ ions increases due to the common ion effect. According to Le Chatelier's principle,this suppresses the dissociation of $H_2S$,thereby lowering the concentration of $S^{2-}$ ions. This low concentration of $S^{2-}$ is sufficient to exceed the solubility product $(K_{sp})$ of group-$II$ sulfides but not that of group-$IV$ sulfides,allowing for selective precipitation.

List-$I$ (Ion)	List-$II$ (Group Number in Cation Analysis)
$A. Co^{2+}$	$I. Group-I$
$B. Mg^{2+}$	$II. Group-III$
$C. Pb^{2+}$	$III. Group-IV$
$D. Al^{3+}$	$IV. Group-VI$

In the analysis of Group-$II$ basic radicals,$H_2S$ gas is passed in the presence of dilute $HCl$ because...

Similar Questions

Which of the following is soluble in yellow ammonium sulphide?

Match List-$I$ with List-$II$:

List-$I$ (Ion) List-$II$ (Group Number in Cation Analysis)

$A. Co^{2+}$ $I. Group-I$

$B. Mg^{2+}$ $II. Group-III$

$C. Pb^{2+}$ $III. Group-IV$

$D. Al^{3+}$ $IV. Group-VI$

Choose the correct answer from the options given below:

When $H_2S$ is passed through a mixture containing $Cu^{2+}$,$Ni^{2+}$,and $Zn^{2+}$ in an acidic solution,which ion will precipitate?

Which of the following ions forms a colored carbonate precipitate?

$A$ 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?

Vedclass Test Series

Exam Paper Generator

Online Exam Module