What is the difference between the EAN value of central metal ion in ${\mathrm{Na}}_2\left[\mathrm{Fe}(\mathrm{CN}{)}_5\mathrm{NO}\right]$ and $\left[\mathrm{Fe}{\left({\mathrm{H}}_2\mathrm{O}\right)}_5{\mathrm{NO}}_3{\mathrm{SO}}_4\right.$

The total number of electrons surrounding a metal atom's nucleus in a metal complex is represented by  the EAN number. The difference between the EAN value of central metal ion in  ${\mathrm{Na}}_2\left[\mathrm{Fe}(\mathrm{CN}{)}_5\mathrm{NO}\right]$ and $\left[\mathrm{Fe}{\left({\mathrm{H}}_2\mathrm{O}\right)}_5{\mathrm{NO}}_4{\mathrm{SO}}_4\right.$ is 1.

$(26-2+12)-(26-1+12)\mid =1$

Hence correct answer is 0001.