JEE MAIN - Chemistry (2025 - 24th January Evening Shift - No. 3)
$$
\begin{aligned}
&\text { Find the compound ' } \mathrm{A} \text { ' from the following reaction sequences. }\\
&\mathrm{A} \xrightarrow{\text { aqua-regia }} \mathrm{B} \xrightarrow[\text { (2) } \mathrm{AcOH}]{\text { (1) } \mathrm{KNO}_2 \mid \mathrm{NH}_4 \mathrm{OH}} \text { yellow ppt }
\end{aligned}
$$
NiS
MnS
ZnS
CoS
Explanation
$\mathrm{CoS} \xrightarrow{\text { Aquaregia }} \mathrm{CoCl}_2 \xrightarrow[2 \cdot \mathrm{AcOH}]{\mathrm{1.KNO}_2 / \mathrm{NH}_4 \mathrm{OH}} \mathrm{K}_3\left[\mathrm{Co}\left(\mathrm{NO}_2\right)_6\right] \downarrow \text { yellow }$
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