Ncert Exercises & Solutions

A brown ring is formed in the ring test for ${NO}_{3}^{-}$ ion. It is due to the formation of:

1. [Fe(H₂O)₅(NO)]²⁺
2. FeSO₄.NO₂
3. [Fe(H₂O)₄ (NO)₂]²⁺
4. FeSO₄. HNO₃