Velence bond theroy describes the bonding in complexs in terms of coordinate -covalent bond resulting from overlap filled ligand orbitals with vacant metal hybrid orbitals This theory explains magnetic behaviour and geometrical shape of coordination compounds Magnetic moment of a complex compound can be determined experimentally and theoretically by using spin only formula
Magnetic moment `sqrtn (n+2)BM` (where n = No. unpaired electrons) .
The value of of spin only magnetic moment for octahedral complex of the following configuration is `2.84BM` The correct statement is
(a) `d^(4)` (in weak field ligand)
(b) `d^(2)` (in weak field and in strong field ligand)
(c) `d^(3)` (in weak field and in strong field ligand)
(d) `d^(5)` (in strong field ligand) .

Options

A. (a) `d^4` (in strong field ligand)
B. (b) `d^2` (in weak field ligand)
C. (c) `d^3` (in weak as well as in strong field ligand)
D. (d) `d^5` (in strong field ligand)

Answer

B

Explanation

Magnetic moment `=sqrt(n(n+2))=2.84`
`:. n=2` (i.e., numbers of unpaired electron)