Question

In the brown ring test, the brown colour of the ring is due to:

• A. Ferrous nitrate
• B. Ferric nitrate
• C. A mixture of $NO$ and $N{O}_2$
• D. Nitrosoferrous sulphate

Answer 1

The correct option is D Nitrosoferrous sulphate

In the brown ring test, the brown color is due to the formation of nitroferrous sulphate (brown ring) by the reaction between $FeS{O}_4$ and $NO$

$FeS{O}_4+NO\to FeS{O}_4.NO$

Hence, option $D$ is correct.