has
two unpaired electrons whereas 
has four unpaired
electrons. Why?
Answer:
In 
Mn
is in +3 state so, it has configuration of 
.
Since 
is a strong field ligand hence
pairing of electron in 3d-orbital takes place.
So, has two unpaired electrons. But in 
is a weak ligand field, so no pairing
takes place and it has 4 unpaired electrons.
is
weak field ligand
So, it has 5
unpaired electron.
is strong field ligand.
It has one
unpaired electron.
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