1.

The brown ring test for nitrates depends on

Answer»

the reduction of nitrate to nitric oxide
oxidation of nitric oxide to nitrogen dioxide
reduction of ferrous sulphate to iron
oxidising ACTION of sulphuric acid

Solution :The brown ring is appeared due to the formation of a brown complex between nitric oxide (FORMED as a result of reduction of the nitrate ION by the `Fe^(2+)` IONS) and `Fe^(2+)` ions.
`NO_(3(aq))^(-)+3Fe_((aq))^(2+)+4H_((aq))^(+)to NO_((g))+3F_((aq))^(3+)+2H_(2)O_((l))`
`underset("pentaaquanitrosonium iron (I) (Brown complex)")(Fe_((aq))^(2+)+NO_((g))+5H_(2)O_((l))to [Fe(H_(2)O)_(5)NO^(+)]^(2_((aq))^(+))`


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