The correct option(s) to distinguish nitrate salts of $\mathrm{Mn}^{2+}$ and $\mathrm{Cu}^{2+}$ take

Question

The correct option(s) to distinguish nitrate salts of $\mathrm{Mn}^{2+}$ and $\mathrm{Cu}^{2+}$ taken separately is (are)\

Professor PC Thomas Classes · Answer

(b, d) : (a) Manganese shows pale purple colour in flame test.\ (b)$\mathrm{Cu}^{2+} \xrightarrow[\mathrm{HCl}]{\mathrm{H}_{2} \mathrm{~S}} \underset{	ext { Black ppt. }}{	ext { CuS } \downarrow}$\ (c)Both $\mathrm{Cu}^{2+}$ and $\mathrm{Mn}^{2+}$ form precipitate with $\mathrm{H}_{2} \mathrm{~S}$ in basic medium.\ (d)$E_{\mathrm{Cu}^{2+} / \mathrm{Cu}}^{\circ}=+0.34 \mathrm{~V}$,\ $E_{\mathrm{Mn}^{2+} / \mathrm{Mn}}^{\mathrm{o}}=-1.18 \mathrm{~V}$\