JEE Advanced2011ChemistryCoordination CompoundsActual
Among the following complexes (K-P), K ₃ [ Fe ( CN )₆ ](K) , [ . Co . ( NH ₃ )₆ ] Cl ₃(L), Na ₃ [ Co ( ox )₃ ](M) , [ Ni ( H ₂ O )₆ ] Cl ₂( ~N ) ; K ₂ [ Pt ( CN )₄ ]( O ) and [ Zn ( H ₂ O )₆ ] ( NO ₃ )₂(P) the diamagnetic complexes are
Options
- AK, L, M, N
- BK, M, O, P
- CL, M, O, P
- DL, M, N, O
Correct answer
C. L, M, O, P
Step-by-step solution
For a diamagnetic complex, there should not be any unpaired electron in the valence shell of central metral. In K ₃ [ Fe ( CN )₆ ] , Fe (III) has d^5 -configuration (odd electrons), hence it is paramagnetic. In [Co( . . NH ₃ )₆ ] Cl ₃ , Co (III) has d^6 configuration in a strong ligand field, hence all the electrons are paired and the complex is diamagnetic. In Na ₃ [ Co ( ox )₃ ] , Co (III) has d^6 -configuration and oxalate being a chelating ligand, very strong ligand and all the six electrons remains paired in l