The cation that will not be precipitated by H2S in the presence of dil. HCl is :
A
Cu2+
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B
As3+
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C
Co2+
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D
Pb2+
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Solution
The correct option is CCo2+ Co2+ ion will not be precipitated by H2S in the presence of dil HCl as dil. HCl will suppress the ionization of H2S
To affect the precipitation H2S should be used in the ammoniacal solution. Co2+~ion is precipitated by H2S in presence of NH4OH which is a group reagent of group IV in cationic analysis.