MCQ
Which of the following complexes has maximum $CFSE$?
- ✓$K _{3}\left[ Fe ( CN )_{6}\right]$
- B$K _{3}\left[ Co ( Ox )_{3}\right]$
- C$K _{3}\left[ CoF _{6}\right]$
- D$K _{3}\left[ Co ( CN )_{6}\right]$
✓
Answer
Correct option: A.
$K _{3}\left[ Fe ( CN )_{6}\right]$
a
In $\left[ Fe ( CN )_{6}\right], Fe ^{3+}, d^{5}$ is low spin and the value of $CFSE$ is
In $\left[ Fe ( CN )_{6}\right], Fe ^{3+}, d^{5}$ is low spin and the value of $CFSE$ is
$-2.0 \Delta_{0}$
So, $K _{3}\left[ Fe ( CN )_{6}\right]$ has maximum $CFSE.$
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