The d-electron configuration of [Fe(H?O)?(NO)]²? and K?[Cr(CN)?] respectively are:

Correct Option - 1


Detailed Solution:

In ${\left. [\mathrm{F}\mathrm{e}?{\left({\mathrm{H}}_2\mathrm{O}\right)}_5\left(\mathrm{N}\mathrm{O}\right)\right]}^{2+}$

${\mathrm{F}\mathrm{e}}^{+1}\left(3{\mathrm{d}}^7\right)$

In ${\left. [{\mathrm{C}\mathrm{r}}^{+3}(\mathrm{C}\mathrm{N}{)}_6\right]}^{3-}$

${\mathrm{C}\mathrm{r}}^{+3}\left(3{\mathrm{d}}^3\right)$

 

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