The ligands and the central metal atom within the coordination sphere do not dissociate and ionize from COORDINATION COMPOUNDS 2 each other upon dissolution as all the ligands are tightly bonded to the central atom and do not ionize. Hence, according to this except option (a) all the complex will dissociate in to ions due to the presence of counter ions. Whereas option (a) does not have any counter ion and therefore won't ionize. So, option (a) is the correct answer.
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