1.

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

Answer»

COLOUR in due to charge transfer phenomenon
Fe and NO both have +1 charge
The COMPLEX species can be represented as `[Fe^(1)(H_(2)O)_(5)NO]^(2+)`
Fe has +2 oxistate and NO is neutral

Solution :Brown ring test : Test for `NO_(3)^(-)` ion
`NO_(3)^(-)+H_(2)SO_(4)toHSO_(4)^(-)+HNO_(3)`
`6FeSO_(4)+2HNO_(3)+3H_(2)SO_(4)to3Fe_(2)(SO_(4))_(3)+4H_(2)O+2NO`
`[Fe(H_(2)O)_(6)]SO_(4)+NOto[UNDERSET("Brown ring")(OVERSET(o+)barFe(H_(2)O)_(5)overset(o+)NO)]SO_(4)^(2-).H_(2)O`


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