For an octahedral complex, which of the following d-electron configuration will give maximum CFSE ?

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High spin ; d6

Low spin ;d5

Low spin ;d4

High spin ; d7

answer is B.

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Detailed Solution

(a) High spin : d6⇒t2g4eg2 CFSE =−0.4Δo (b) Low spin : d5⇒t2g5eg0 CFSE =−2.0Δo (c) Low spin :d4⇒t2g4eg0 CFSE=−1.6Δo (d) High spin : d7 CFSE =−0.8Δo

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