Consider the transition metal ions 
and 
and all form low spin octahedral complexes. The correct decreasing order of unpaired electrons in their respective d-orbitals of the complexes is
Text Solution
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For low spin octahedral complexes, electrons fill the 
orbitals first before pairing or moving to 
orbitals.
The configuration depends on the number of d-electrons.
For 
: Electronic configuration is 
. In an octahedral field, the configuration is 
. Number of unpaired electrons 
.
For 
: Electronic configuration is 
. For low spin, the configuration is 
. Number of unpaired electrons 
.
For 
: Electronic configuration is 
. For low spin, the configuration is 
. Number of unpaired electrons ( 
.
For 
: Electronic configuration is 
. For low spin, the configuration is 
. Number of unpaired electrons ( 
.
Comparing the number of unpaired electrons:
.
The correct decreasing order is 
.
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