Q.47 Using valence bond theory, explain the following in relation to the complexes given below


(a) Type of hybridisation 

(b) lnner or outer robital comples

(c) Magnetic behaviour

(d) Spin only magnetic moment value.


(i) d2sp3 hybridisation 

(ii) lnner orbital complex because (n-1)d-orbitals are used.

(iii) Paramagnetic, as two unpaired electons are present. 

(iv) Spin only magnetic moment (μ)=2(2+2)=8=2.82 BM

(b) Co(NH3)63+Co3+=3d64s0

(NH3 pair up the unpaired 3d electons)

(i) d2sp3 hybridisation 

(ii) lnner orbital complex because of the invovement of *n-1) d-orbital in bonding.

(iii) Diamagnetic, as no unpaired electron is preset.

(iv) μ=n(n+2)=0(0+2)=0 (Zero)

(c) Cr(H2O63+

(i) d2sp3 hybridisation 

(ii) lnner orbital complex (as(n-1) d-orbital take part)

(iii) Paramagnetic (as three unpaired electrons are present 

(iv) μ=n(n+2)=3(3+2) =15=3.87 BM

(d) Fe(Cl)64-Fe2+=3d6

(i) sp3d2 hybridisation

(ii) Outer orbital complex because nd-orbitals are involved in hybridisation.

(iii) Paramagnetic (because of the presence of four unpaired electrons).

(iv) μ=n((n+2)=4(4+2)=24=4.9BM