Question

Calculate the oxidation number of underlined element in the following compound:
$N{a}_2\left[\underset{-}{Fe}\right(CN{)}_5\left(N{O}^{+}\right)]$

• A. $-2$
• B. $+3$
• C. $+1$
• D. $+2$

Answer 1

The correct option is D $+2$

Let, oxidation number of $Fe$ be $x$ in $N{a}_2\left[Fe\right(CN{)}_5\left]\right(N{O}^{+}\left)\right]$
$\text{charge on}C{N}^{-}=-1$
$\text{charge on}N{O}^{+}=+1$
charge on co-ordination sphere=-2
$\Rightarrow x-5+1=-2$
$\Rightarrow x=+2$