\( \mathrm{H}_{2} \mathrm{~S} \) in the presence of \( \mathrm{HCl}...

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\( \mathrm{H}_{2} \mathrm{~S} \) in the presence of \( \mathrm{HCl} \) precipitates II group but not IV group because :
\( \mathrm{P} \)
(a) \( \mathrm{HCl} \) activates \( \mathrm{H}_{2} \mathrm{~S} \)
W)
(b) \( \mathrm{HCl} \) increases concentration of \( \mathrm{Cl}^{-} \)
(c) \( \mathrm{HCl} \) decreases concentration of \( \mathrm{S}^{2-} \)
(d) \( \mathrm{HCl} \) lowers the solubility of \( \mathrm{H}_{2} \mathrm{~S} \) in solution
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