$\mathrm{Co}^{3+}(\text { strong field ligand }) \Rightarrow 3 \mathrm{~d}^6\left(\mathrm{t}_{2 \mathrm{~g}}^6, \mathrm{e}_{\mathrm{g}}^0\right),$
Hybridisation : $d^2 \mathrm{sp}^3$
Inner obital complex(spin paired complex)
Pairing will take place.
$\left[\mathrm{CoF}_6\right]^{3-}$
$\mathrm{Co}^{3+}$ (weak field ligand) $\Rightarrow 3 \mathrm{~d}^6\left(\mathrm{t}_{2 \mathrm{~g}}^4, \mathrm{e}_{\mathrm{g}}^2\right)$
Hybridisation : $\mathrm{sp}^3 \mathrm{~d}^2$
Outer orbital complex (spin free complex) no pairing will take place
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$'X'\,\,\xrightarrow{{water}}$ Insoluble
$'X'\xrightarrow{{5\% \,HCl}}$ Insoluble
$'X'\xrightarrow{{10\% \,NaOH}}$ Insoluble
$'X'\xrightarrow{{10\% \,NaHC{O_3}}}$ Insoluble
| (a) Pure nitrogen | (i) Chlorine |
| (b) Haber process | (ii) Sulphuric acid |
| (c) Contact process | (iii) Ammonia |
| (d) Deacon's process | (iv) Sodium azide or Barium azide |
Which of the following is the correct option ?
$(a)\quad (b)\quad (c) \quad (d)$
