Which is the incorrect observation ? - Vidyadip

MCQ

Which is the incorrect observation ?

A
For the complex, $[CoF_6]^{3-}, F^-$ is a weak-field ligand, so that $\Delta _{oct} < P$ (electron-pairing energy) and is thus high spin complex
B
For the complex, $[Co(NH_3)_6]^{3+}, NH_3$ is a strong-field ligand, so that $\Delta _{oct} > P$ and thus low spin complex
✓
Stability order $[Co(H_2O)_6]^{+3} > [Rh(H_2O)_6]^{+3}$
D
Greater the ionic charge on the central metal ion, the greater the value of $\Delta (CFSE)$

✓

Answer

Correct option: C.

Stability order $[Co(H_2O)_6]^{+3} > [Rh(H_2O)_6]^{+3}$

c
$3 \mathrm{d}<4 \mathrm{d}<5 \mathrm{d}\left(Z_{\mathrm{eff}}\right) \Rightarrow$ Stability

$\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{+3}<\left[\mathrm{Rh}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{+3}$

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