How Mn2+(aq) ion gives light pink colour ?
In high spin octahedral d5 complexes like [Mn(H2O)6]2+, Mn2+ ion has five unpaired electrons which are filled parallelly in all the t2g and eg orbitals. Since any d-d transition involves reversal of spins, therefore, d-d transitions are spin forbidden. The d-d transitions are also Laporte forbidden because of the presence of centre of symmetry. Thus, Mn2+ (aq) ion gives light pink colour.
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