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Q. The cation that will not be precipitated by $H_2S$ in the presence of dilute $HCl$ is :

JEE MainJEE Main 2015

Solution:

$Cu ^{2+}, Pb ^{2+}, A s ^{3+}$ are all precipitated in Group II by $H _{2} S$ in the presence of $HCl.$

$Co ^{2+}$ cannot be precipitated in group III