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# An octahedral complex of $\;Co^{3+}\;$ is diamagnetic .The hybridisation involved in the formation of the complex is :

$(a)\;sp^{3}d^{2}\qquad(b)\;dsp^{2}\qquad(c)\;d^{2}sp^{3}\qquad(d)\;dsp^{3}d$

Can you answer this question?