Question

The oxidation state of the underlined element in the given compound is:
$N{a}_2\left[\underset{–}{Fe}\right(CN{)}_{5}NO]$

• A. -2
• B. 2
• C. 3
• D. none of these

Answer 1

The correct option is B 2

Given compound $N{a}_2\left[Fe\right(CN{)}_{5}NO]$

On dividing into ions we get

$\left[Fe\right(CN{)}_{5}NO{]}^{-3}$ and $3N{a}^{+1}$

$\Rightarrow x+(-5)+0=-3$

$\Rightarrow x=-3+5$

$\Rightarrow x=+2$ .