Question

The brown complex obtained in the detection of nitrate radical is formulated as $\left[{Fe\left(H_{2}O\right)}_{5}NO\right]{SO}_4$. What is the oxidation number of $Fe$ in this complex?

• A. 1
• B. 2
• C. 3
• D. 0

Answer 1

The correct option is A 1

The brown colour complex obtained in the detection of nitrate radical is formulated as $\left[{Fe\left(H_{2}O\right)}_{5}NO\right]{SO}_4$. In this complex, oxidation state of iron is +1. The univalent character of iron in the complex is justified by the presence of a coordinated ${NO}^{+}$ group.