nice doubt

 

as to question one.

 

both the set of orbitals are only higher than the actual energy they should have been possessing.

actualy baricentre is the mean energy(average) of the energies of the two set of orbitals.

If you closly look at it then you will find that the energies are in delta .

 

it means t2g are possessing 2\5 delta less than the mean energies.(denoted by the negative sign)

ands eg possess 3\5 more than the mean energy