Which of the following coordination complexes is heteroleptic AND contains the central metal ion in the +3 oxidation state?

Step-by-step solution

A heteroleptic complex is one in which the central metal is bound to more than one kind of ligand. Let us evaluate each option: 1) [ Co ( NH ₃)₆]³⁺ : Contains only one type of ligand ( NH ₃ ), so it is homoleptic. The oxidation state of Co is +3 . 2) [ Cr ( H ₂ O )₄ Cl ₂]⁺ : Contains two types of ligands ( H ₂ O and Cl ^- ), so it is heteroleptic. Let x be the oxidation state of Cr. x + 4(0) + 2(-1) = +1 x = +3 . This satisfies both conditions. 3) [ Pt ( NH ₃)₂ Cl ₂] : Contains two types of ligands, so it is hetero