What is the type of hybridisation and the geometry respectively found in $\left[\mathrm{CoF}_{6}\right]^{3-}…

1. $\mathrm{d}^{3} \mathrm{sp}^{3}$ and pentagonal bipyramidal
2. $\mathrm{sp}^{3} \mathrm{~d}^{2}$ and octahedral
3. $\mathrm{dsp}^{3}$ and trigonal bipyramidal
4. $\mathrm{dsp}^{2}$ and pentagonal bipyramidal

Solution

$\left[\mathrm{CoF}_{6}\right]^{3 \Theta}$ $; \quad \mathrm{Co}^{+3}$ has $d^{6}$ configuration ; Halogen donor are WFL

Asked in: MHT CET 2020 (12 Oct Shift 2)

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