Question

The oxidation number of underlined element in $N{a}_2\left[\underset{–}{Fe}{\left(CN\right)}_{5}N{O}^{+}\right]$ compound is :

• A. 2
• B. 3
• C. 1
• D. None of these

Answer 1

The correct option is A 2

In $N{a}_2\left[Fe\right(CN{)}_{5}N{O}^{+}]$ the oxidation state of $Fe$ is determined as follows:

$Na$ has $+1$ O.S. , so $2Na$ will give $2+$ charge.

Hence charge on complex is $-2$.

Let $Fe$ have O.S. $=x$.

so $x+(-1)5+1=-2$

$x=+5-1-2=+2$.

So, $Fe$ has $+2$ oxidation state.