Write IUPAC name for each of the following and indicate oxidation state, electronic configuration and coordination number. Also give stereochemistry, magnetic moment :
`K[Cr(H_(2)O)_(2)(C_(2)O_(4))_(2)].3H_(2)O`

Explanation

IUPAC name : potassium diaquadioxalato - chromate (III) trihydrate
Coordination no. of `Cr=2xx1+2xx2=6`
Stereochemistry = octahedral
Oxidation state of `Cr=1xx(+1)+x+2xx0+2xx(-2)=0,`
or, `x=+3`
Electronic configuration of `Cr^(3+)=3d^(3)=t_(2)^(3)e_(g)^(0)`
No. of unpaired electrons (n) = 3, Magnetic moment
`(mu)=sqrt(n(n+2))=sqrt(3(3+2))=sqrt(15)=3.87BM`