Which of the following options is incorrect?

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(D) In qualitative inorganic analysis,cations are classified into groups based on their reaction with specific group reagents.Group-$I$ cations $(Pb^{

Vedclass · Accepted Answer

Group-$IV$,Cation-$Ba^{2+}, Ca^{2+}$,Group reagent-$NaOH + Na_2CO_3$

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(D) In qualitative inorganic analysis,cations are classified into groups based on their reaction with specific group reagents.Group-$I$ cations $(Pb^{2+}, Ag^+, Hg_2^{2+})$ are precipitated as chlorides using dil. $HCl$.Group-$II$ cations $(Cu^{2+}, As^{3+}, etc.)$ are precipitated as sulfides using $H_2S$ in the presence of dil. $HCl$.Group-$III$ cations $(Fe^{3+}, Al^{3+}, Cr^{3+})$ are precipitated as hydroxides using $NH_4OH$ in the presence of $NH_4Cl$.Group-$IV$ cations $(Zn^{2+}, Mn^{2+}, Ni^{2+}, Co^{2+})$ are precipitated as sulfides using $H_2S$ in the presence of $NH_4OH$.Group-$V$ cations $(Ba^{2+}, Sr^{2+}, Ca^{2+})$ are precipitated as carbonates using $(NH_4)_2CO_3$ in the presence of $NH_4OH$ and $NH_4Cl$.Option $D$ is incorrect because $Ba^{2+}$ and $Ca^{2+}$ belong to Group-$V$,not Group-$IV$,and the reagent listed is also incorrect.

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