Receptor Ligand Interaction

- Statement A: Co is indeed easily oxidized to Co in the presence of strong ligands like CN due to the ligand's ability to stabilize the higher oxidation state, making it an accurate statement.
- Statement B: The complex is a low-spin octahedral complex and, due to the pairing of electrons, it is actually diamagnetic, not paramagnetic. Therefore, this statement is incorrect.
- Statement C: Removal of H O molecules from on strong heating typically converts the compound to a colourless form, making this statement true.
- Statement D: The formula is not a general expression for crystal field splitting. Instead, it is a specific case for a Tetrahedral field, and therefore, this statement is incorrect.
Thus, the correct statements are A and C.