A brown ring is formed in the ring test for NO₃
– ion. It is due to the formation of

Question

A brown ring is formed in the ring test for NO 3 – ion. It is due to the formation of

Philoid · Accepted Answer

When freshly prepared solution of FeSO₄ is added in the solution containing NO₃ ion. It leads to the formation of brown coloured complex. This is known as brown colour test of nitrate.

+ 3Fe²⁺ + 4H⁺ NO + 3Fe³⁺ + 2H₂O

[Fe(H₂O₆)]²⁺ + NO [Fe(H₂O)₅ (NO)]²⁺ + H₂O

Hence the correct option is (i).

A brown ring is formed in the ring test for NO3– ion. It is due to the formation of

A brown ring is formed in the ring test for NO₃
– ion. It is due to the formation of