H_2 S in the presence of HCl precipitate II group but not IV group bec – InterviewSolution

1.	H_2 S in the presence of HCl precipitate II group but not IV group because
Answer» 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. Solution :Due to COMMON ion effect , HCl decreases concentration of `S^(2-)` ions and only II group basic radicals are precipitated.

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