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# Solve this following

Question:

The crystal fied stabilization energy (CFSE) of $\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right] \mathrm{Cl}_{2}$ and $\mathrm{K}_{2}\left[\mathrm{NiCl}_{4}\right]$, respectively, are :-

1. $-0.4 \Delta_{\mathrm{O}}$ and $-0.8 \Delta_{\mathrm{t}}$

2. $-0.4 \Delta_{\mathrm{O}}$ and $-1.2 \Delta_{\mathrm{t}}$

3. $-2.4 \Delta_{\mathrm{O}}$ and $-1.2 \Delta_{\mathrm{t}}$

4. $-0.6 \Delta_{\mathrm{O}}$ and $-0.8 \Delta_{\mathrm{t}}$

Correct Option: 1

Solution: