Pick out the correct statement from the following: 1. Cobalt (III) is more stable in octahedral complexes. 2. Zinc forms coloured ions or complexes 3.Most of the d-block elements and their compounds are ferromagnetic. ltBrgt 4. Osmium shows (VIII) oxidation state 5. cobalt (II) is more stable in octahedral complexes.

Pick out the correct statement from the following: 1. Cobalt (III) is

1.	Pick out the correct statement from the following: 1. Cobalt (III) is more stable in octahedral complexes. 2. Zinc forms coloured ions or complexes 3.Most of the d-block elements and their compounds are ferromagnetic. ltBrgt 4. Osmium shows (VIII) oxidation state 5. cobalt (II) is more stable in octahedral complexes.
Answer» 1 and 2 1 and 3 2 and 4 1 and 4 Solution :In `Co^(+3)` ion, ELECTRONIC configuration `\|Ar\|_(18)3d^(6)4s^(0)`. For octahedral complex 4 UNPAIRED electron get paired and in configuration become `t_(2g)^(6)eg^(0)` and HYBRIDIZATION `d^(2)sp^3` Os has maximum VIII oxidation state.