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In the brown ring test, the brown colour of the ring is due to
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nitrosoferrous sulphate
The brown ring is due to the formation of a brown complex between nitric oxide and $\mathrm{Fe}^{2+}$ ions.
$\mathrm{NO}_{3}^{-}+3 \mathrm{Fe}^{2+}+4 \mathrm{H}^{+} \longrightarrow 3 \mathrm{Fe}^{3+}+\mathrm{NO}+2 \mathrm{H}_{2} \mathrm{O}$
or
$\mathrm{NO}_{3}^{-}+3 \mathrm{Fe}^{2+}+4 \mathrm{H}^{+} \longrightarrow 3 \mathrm{Fe}^{3+}+\mathrm{NO}+2 \mathrm{H}_{2} \mathrm{O}$
or
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