$\mathrm{Co}^{+3}=3 \mathrm{d}^{6} 4 \mathrm{s}^{0} 4 \mathrm{p}^{0}$
$\because$ in presence of strong field ligand, pairing of electrons occurs so in this complex no unpaired electron is present and
it is low spin complex.
અહીંયા $en=$ ઈથિલીન ડાયએમાઈન