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  4. The total number of cationic radicals that give black precipitate with H2S in acid solution is: Pb2 +,Zn2 +,Cu2 +,Mn2 +,Hg2 +,Cr3 +,Cd2 +

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Q. The total number of cationic radicals that give black precipitate with $H_{2}S$ in acid solution is :
$Pb^{2 +},Zn^{2 +},Cu^{2 +},Mn^{2 +},Hg^{2 +},Cr^{3 +},Cd^{2 +}$

NTA AbhyasNTA Abhyas 2022

Solution:

PbS, CuS and HgS are black precipitates.