What is the formula for hexafluorocobaltate(III)? Is it high spin or low spin?
Notice the "-ate" at the end. That indicates a negative overall charge to the complex. From there, we can deduce the oxidation state of cobalt.
"Hexafluoro" indicates six fluoro (
Since the overall charge is negative, and
where the oxidation state of cobalt here must be
#overbrace((+3))^(Co) + overbrace(6(-1))^(6xxF^(-)) = overbrace(-3)^("overall")# #color(blue)(sqrt"")#
Is this compound colored? Would you expect any charge-transfer bands in the UV-VIS spectrum?
(There should be ligand-to-metal charge transfer, LMCT.)
Is there Jahn-Teller distortion in this complex? Is it weak or strong?
(should be weak)
Is this compound paramagnetic, i.e. does it have any unpaired electrons?
(yes. Should be 4.)
What is the spin-only magnetic moment?
#mu_S = 2.0023sqrt(S(S+1))#, where #S#is the total electron spin.)
These are all questions that are totally valid on third-year or fourth-year undergraduate exams. The first and third bullet point questions, probably first or second year.