1.

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

Answer»

HCl ACTIVATES `H_(2)S`
HCl incraeses the concentration of `Cl^(-)`
HCl decreases the concentration of `S^(2-)` ions
HCl LOWERS the solubility of `H_(2)S` in the solution

Solution :Due to common ion effect, HCl suppresses the IONISATION of `H_(2)S` thus decreasing the concentration of `S^(2-)` ions. Only GROUP II radicals are precipitated.


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