What is the hybridisation of $\left[\mathrm{CrF}_6\right]^{3-}$ ?

• A

  $s p^3 d$
• B

  $s p^3 d^2$
• Correct answer
  C

  $d^2 s p^3$
• D

  $d^2 s p$

Solution

The electronic configuration of $\mathrm{Cr}$ is $[\mathrm{Ar}] 3 d^5 4 s^1$.
$\left[\mathrm{CrF}_6\right]^{3-}$ has $d^2 s p^3$-hybridisation and octahedral geometry.

Hence, the correct answer is option: 'C'.