H2 S in the presence of HCl precipitate ...

`H_2 S` in the presence of HCl precipitate II group but not IV group because

HCl activates `H_2 S`

HCl increases concentration of CI

HCI decreases concentration of `S^2`

HCI lowers the solubility of `H_2 S` in solution.

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The correct Answer is:

Due to common ion effect , HCl decreases concentration of `S^(2-)` ions and only II group basic radicals are precipitated.

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