1. Tardigrade
  2. Question
  3. Chemistry
  4. In the brown ring test, the brown colour of the ring is due to

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. In the brown ring test, the brown colour of the ring is due to

KCETKCET 2008The p-Block Elements - Part2

Solution:

Ring test: To the nitrate salt, add freshly prepared $FeSO _{4}$ solution and then cone $H _{2} SO _{4}$ carefully by the sides of test-tube. A dark brown ring of ferrous nitrososulphate is formed.

$NaNO _{3}+ H _{2} SO _{4} \longrightarrow NaHSO _{4}+ HNO _{3}$

$2 HNO _{3}+6 FeSO _{4}+3 H _{2} SO \longrightarrow 3 Fe _{2}\left( SO _{4}\right)_{3}+2 N O+4 H_{O}$

$FeSO _{4}+ NO \longrightarrow \underset{\text{ferrous nitrososulphate}}{[ Fe \cdot NO ] SO _{4}}$