The cation that will not be precipitated by H_2SinthepresenceofdilHCl$ is:
A
As3+
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B
Pb2+
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C
Cu2+
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D
Co2+
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Solution
The correct option is DCo2+ Co2+ 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.