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A mixture containing $\mathrm{Cu}^{2+}$ and $\mathrm{Ni}^{2+}$ can be separated for identification by
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Passing $\mathrm{H}_2 \mathrm{~S}$ in acid medium
$\mathrm{Cu}^{2+}$ will be precipitated as $\mathrm{CuS}$ in acidic medium where as $\mathrm{Ni}^{2+}$ is not precipitated.
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