In test of `NO_(3)^(-)` ion, the dark brown ring complex is formed, which is true of this complex?

Options

A. the colour is due to charge transfer spectra
B. iron and NO both have +1 charge
C. The complex species can be represented as `[Fe^(I)(H_(2)O)_(5)NO]^(2+)`
D. Iron has +2 oxidation state and NO is neutral

Answer

A, B, C

Explanation

Nitrate ion gives a brown ring when reacts with conc. `H_(2)SO_(4)` in presence of `FeSO_(4)` due to formation of `[Fe(H_(2)O)_(5)NO]SO_(4)` complex compound. Brown colour is just due charge transfer spectra.