The correct option(s) to distinguish nitrate salts of Mn^ 2 + and...

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

(1) $Mn^{2 +}$ shows the characteristic green colour in the flame test

(2) only $Cu^{2 +}$ shows the formation of precipitate by passing ${H}_{2}S$ in acidic medium

(3) only $Mn^{2 +}$ shows the formation of precipitate by passing ${H}_{2}S$ in faintly basic medium

(4) {\text{Cu}^{2 +} | \text{Cu} has higher reduction potential than {\text{Mn}^{2 +} | \text{Mn} (measured under similar conditions)