1.

In the dark brown ring test for nitrate ions

Answer»

The colour is DUE to charge transfer SPECTRA
Iron has a formal +2 oxidation STATE and NO has no charge
The complex species can be represenctedas `[Fe^(1)(H_2O)_5NO^(+)]SO_(4)`
The dark brown colour is due to `NO_2` evolved in the reaction

Solution :The colour of the brown ring is due to `E^(-)` - transfer from NO to `Fe^(2+)` and the complex is `[Fe(H_2O)_5NO] SO_4`


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