AIPMT 2008 Physics and Chemistry Paper

The oxidation state of Co in [Co(OX)2(OH)2]−is +5. This is not possible. The oxidation state of Ti in [Ti(NH3)6]3+ is +3.Ti3+ has just one unpaired electron. O.S. of 'V' in [V(gly)2(OH)2(NH3)2]+is again +3 and it means the number of unpaired electrons is 2 . Oxidation state of Fe in [Fe(en‌ ) (bpy) ‌(NH3)2]2+. is +2. So it contains 4 unpaired electron. More is the oxidation number of unpaired electron more will be the paramagnetic character.