KEAM 2010 Physics and Chemistry Paper

1. Electronic configuration of Mn is 3d5,4s2 and hence, it exhibits +7 oxidation state.
2. Zinc does not form coloured ions as it has completely filled 3d10,4s2 configuration.
3. In [CoF6]3−, fluoride is a weak field ligand and hence, does not cause pairing of electrons in d7 system of Co3+. Thus, the complex is paramagnetic.
Electronic configuration of Co3+ is 4. Sc has outer configuration of 3d14s2, hence it can form a maximum of +3 oxidation state.
5. Zn exhibits only +2 oxidation state as in this it is the most stable.