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  4. Origional solution xrightarrow [H2 S textgas]dil . HCl Precipitate How many of the below given cations will give this result? Mg2 + , Ca2 + , Ni2 + , Fe3 + , Pb2 + , Cu2 + , Ba2 +

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Q. Origional solution $\xrightarrow [H_{2} S \text{gas}]{dil . HCl}$ Precipitate
How many of the below given cations will give this result?
$Mg^{2 +}$ , $Ca^{2 +}$ , $Ni^{2 +}$ , $Fe^{3 +}$ , $Pb^{2 +}$ , $Cu^{2 +}$ , $Ba^{2 +}$

NTA AbhyasNTA Abhyas 2022

Solution:

The given group reagent [ $Dil.HCl$ $+H_{2}S$ gas] is for precipitating group $II$ ions as their sulphides. Among the given cations, only $Pb^{2 +}$ and $Cu^{2 +}$ are group $II$ cations.