An octahedral complex of $\mathrm{Co}^{3+}$ is diamagnetic. The hybridisation involved in the formation of the complex is :
$d^{2} s p^{3}$
$d s p^{3} d$
$d s p^{2}$
$s p^{3} d^{2}$
Correct Option: 1
Solution not required
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