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 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) `Cu^(2+)|"Cu has higher reduction potential then "Mn^(2+)|` (measured under similar conditions)

Options

A. `Mn^(2+)` shows the characteristic green colour in the flame test
B. only `Cu^(2+)` shows the formation of precipitate by passing `H_2S` in acidic medium
C. only `Mn^(2+)` shows the formation of precipitate by passing `H_2S` in faintly basic medium
D. `Cu^(2+) | Cu` has higher reduction potential than `Mn^(2+) | Mn` (measured under similar conditions).

Answer

B, D

Explanation

only `Cu^(2+)` shows the formation of precipitate by passing `H_2S` in acidic medium
`Cu^(2+) | Cu` has higher reduction potential than `Mn^(2+) | Mn` (measured under similar conditions).