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

Only $M{n}^{2+}$ shows the formation of precipitate by passing ${\mathrm{H}}_2\mathrm{S}$ in faintly basic medium

${\mathrm{Cu}}^{2+}$/Cu has higher reduction potential than $M{n}^{2+}$/Mn (measured under similar conditions)

Only${\mathrm{Cu}}^{2+}$ shows the formation of precipitate by passing ${\mathrm{H}}_2\mathrm{S}$ in acidic medium

$M{n}^{2+}$shows the characteristic green colour in the flame test