For octahedral complex, which of the following dn configurations of metal cation cannot exist in high spin and low spin forms ?
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a
d3 and d8
b
d3 and d5
c
d3 and d6
d
d4 and d8
answer is A.
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Detailed Solution
In d3 and d8 octahedral complexes number of unpaired e-s at central metal atom,/ion never changes, therefore for such octahedral complexes terms high spin and low spin not used.