1.

The brown ring test for NO_(2)^(-) and NO_(3)^(-) is due to the formation of complex ion with formula :

Answer»

`[Fe(H_2O)_6]^(2+)`
`[Fe(NO)(CN)_5]^(2+)`
`[Fe(H_2O)_5NO]^(2+)`
`[Fe(H_2O)(NO)_5]^(2+)`

SOLUTION :REACTION of brown ring test


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