MCQ
The $Cl - Co - Cl$ bond angle values in a fac$\left[ Co \left( NH _3\right)_3 Cl _3\right]$ complex is/are:
- A$90^{\circ}$ and $180^{\circ}$
- ✓$90^{\circ}$
- C$180^{\circ}$
- D$90^{\circ}$ and $120^{\circ}$

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Compound $\rightarrow$ O.State of $C.M.I.$
$O(g) + e^- \to O^-(g); \Delta H = - 142 \,kJ \,mol^{-1}$
$O^-(g) + e \to O^{2-} (g); \Delta H = 844\, kJ \,mol^{-1}$
This is because
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