Question

The hybridisation of atom $'X'$ with atomic number $27$ in $\left[X F _{6}\right]^{3-}$ is

• A. $dsp^2$
• B. $d^2sp^3$
• C. $sp^3d^2$
• D. $sp^3$

Answer 1

Answer: (C)

$sp^3d^2$

Answer 2

The atomic number of $Co$ is $27$ and its valence shell electronic configuration is $3 d^{7} 4 s^{2} .$

Hence, $X= Co$ atom and $\left[\left( CoF _{6}\right)^{3+}\right]$ complex have $s p^{3} d^{2}$ hybridisation and shape is octahedral.