1.

In test of NO_(3)^(-) ion, the dark brown ring complex is forme,d which is true of thic complex?

Answer»

the colour is due to CHARGE transfer SPECTRA
IRON and NO both have +1 charge
The complex species can be represented as `[Fe^(1)(H_(2)O)(5)NO]^(3+)`
Iron has +2 oxidation state and NO is neutral

Solution :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.


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