`H_(2)S` in the presence of `HCl` precipitates `II` group but not `IV` group because:

`H_(2)S` in the presence of `HCl` precipitates `II` group but not `IV` group because:
A. Ionisation of `H_(2)S` is increased
B. Ionisation of `H_(2)S` is decreased
C. Precipitation of `Pb^(+2)` is avoided
D. Precipitated of `Mn^(+2)` as sulphide is facilitated

`H_(2)S` in the presence of `HCl` precipitates `II` group but not `IV` group because:

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