\( \mathrm{H}_{2} \mathrm{~S} \) gas, on passing through an acidic ...

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\( \mathrm{H}_{2} \mathrm{~S} \) gas, on passing through an acidic solution, if
P yellow precipitate is obtained it indicates the

W presence of-
(1) \( \mathrm{As}^{3+} \)
(2) \( \mathrm{Sb}^{3+} \)
(3) \( \mathrm{Pb}^{2+} \)
(4) \( \mathrm{Cu}^{2+} \)
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