An unknown salt (anion) reacts with dilute HC | vedclass

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Question

(C) The gas $X$ with a rotten egg smell is hydrogen sulfide $(H_2S)$.
$H_2S$ reacts with metal ions to form metal sulfides.
$1$. $H_2S + Zn^{2+} \ri

Vedclass · Accepted Answer

It gives a pink colored precipitate with $Ni^{2+}$.

Vedclass · Answer

(C) The gas $X$ with a rotten egg smell is hydrogen sulfide $(H_2S)$.
$H_2S$ reacts with metal ions to form metal sulfides.
$1$. $H_2S + Zn^{2+} ightarrow ZnS (	ext{white ppt}) + 2H^+$.
$2$. $H_2S + Cd^{2+} ightarrow CdS (	ext{yellow ppt}) + 2H^+$.
$3$. $H_2S + Ni^{2+} ightarrow NiS (	ext{black ppt}) + 2H^+$.
$4$. $H_2S + Cu^{2+} ightarrow CuS (	ext{black ppt}) + 2H^+$.
Option $C$ states that $Ni^{2+}$ gives a pink precipitate,which is incorrect because $NiS$ is black.

An unknown salt (anion) reacts with dilute $HCl$ to produce gas $X$ (rotten egg smell). Choose the incorrect option regarding gas $X$.

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