`H_(2)S` in the presence of `HCl` precipitates `II` group but not `IV` group because:A. `HCl` activates `H_(2)S`B. `HCl` increase concentration of `Cl^(-)`C. `HCl` decreases concentration of `S^(2-)`D. `HCl` lowers the solubility of `H_(2)S` in solution.

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

1.	`H_(2)S` in the presence of `HCl` precipitates `II` group but not `IV` group because:A. `HCl` activates `H_(2)S`B. `HCl` increase concentration of `Cl^(-)`C. `HCl` decreases concentration of `S^(2-)`D. `HCl` lowers the solubility of `H_(2)S` in solution.
Answer» Correct Answer - C `H_(2)S hArr2H^(+)+S^(2-),HClhArrH_(2)^(+) +Cl^(-)` Due to common ion effect, the ionisation of `H_(2)S` is suppressed and thus low concentration of `S^(2-)` ions is obtained This much of `S^(2-)` ions concentration is enough to precipitate only `II^(nd)` group cations (because of the low `K_(SP)` of `II^(nd)` group sulphides)

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`H_(2)S` in the presence of `HCl` precipitates `II` group but not `IV` group because:A. `HCl` activates `H_(2)S`B. `HCl` increase concentration of `Cl^(-)`C. `HCl` decreases concentration of `S^(2-)`D. `HCl` lowers the solubility of `H_(2)S` in solution.

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