Question

respectedsir / mam

kindly explain[Co(C 2 O 4 ) 3 ]3 − is diamagnetic. Acc.vbt has d 2 sp 3 hybridisation,

why and how? since C2O 4 -2 IS DIDENTATE LIGAND

Answer 1

Yes. The cobalt is presented as Co3+ ion.
so 3 c2o4 gives 6 electrons to cobalt 3+.
hence there are extra 3 electrons present which is mentioned as 3-.

okay !!
now , in configuration d6, there are 4 unpaired electrons. now they are paired up.
so incoming 6 electrons are filled as d²sp³