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

Question

`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. `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.

Monjur Alahi

4 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

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)