Question

The brown ring complex compound is formulated as $\left[Fe\right(H_{2}O{)}_{5}NO]S{O}_4$. The oxidation state of iron is:

• A. + 1
• B. + 2
• C. + 3
• D. + 6

Answer 1

Answer: (A)

+ 1

Brown ring complex is an iron complex of great significance in inorganic chemistry and salt analysis.

Its formula: $\left[Fe\right(H_{2}O{)}_{5}NO]S{O}_4$ (coordination compound)

In this complex, $NO$ is in oxidation state of $+1.$

So,$\left[Fe\right(H_{2}O{)}_{5}NO{]}^{+2}$ $S{O}_4^{-2}$

$\overline{x}$ $\overline{0}$ $\overline{+1}$

$x+1=+2$

$x=+1$